There is a total of 195 clues beginning with u-
- U-2 fliers
- U-2 or Zero
- U-2 overseers
- U-2 pilot
- U-2 pilot, eg
- U-2, eg
- U-2, for one
- U-235 and C-14
- U-235 and U-238
- U-235 and U-238 eg
- U-235 is one
- U-235 or C-14, eg
- U-238, for one
- U-boat
- U-boat assignment?
- U-boat base between Brest and St Nazaire
- U-boat base in Northern Germany
- U-boat chaser
- U-boat detector
- U-boat features
- U-boat finder
- U-boat gear
- U-boat home
- U-boat locater
- U-boat movie of 1981
- U-boat rental contract?
- U-boat repair places
- U-boat victim, May 7, 1915
- U-boat's aid
- U-boat's attacker
- U-boat, eg
- U-boats
- U-boats for short
- U-boats
- U-ey from NNE
- U-ey from WSW
- U-Haul
- U-Haul alternative
- U-Haul alternatives
- U-Haul competitor
- U-Haul driver's place
- U-Haul offering
- U-Haul option
- U-Haul rental
- U-Haul rentals
- U-Haul renter
- U-Haul rival
- U-Haul truck, eg
- U-Haul truck, for one
- U-Haul unit
- U-Haul van, for example
- U-Haul vans, eg
- U-Haul vehicle
- U-matic successor
- U-Md teams
- U-pick locale
- U-shape
- U-shaped
- U-shaped 5-Across
- U-shaped bend in a river
- U-shaped bend in a river
- U-shaped bike accessory
- U-shaped bite
- U-shaped charm
- U-shaped curve in a stream
- U-shaped curves in streams
- U-shaped device on a boat
- U-shaped devices
- U-shaped drainpipe
- U-shaped fastener
- U-shaped fasteners
- U-shaped fitting used on automatic garage doors
- U-shaped frames
- U-shaped instrument
- U-shaped instruments
- U-shaped lake
- U-shaped musical instrument
- U-shaped object pitched at a stake
- U-shaped object
- U-shaped part
- U-shaped part of a drainpipe
- U-shaped part of a road
- U-shaped peninsula's enclosure
- U-shaped piece of wood
- U-shaped pillow
- U-shaped pipe
- U-shaped river bend
- U-shaped river bends
- U-shaped section of a pipe
- U-shaped section of pipe
- U-shaped stringed instrument
- U-shaped stringed instruments
- U-shaped tubes on trombones
- U-shaped wire
- U-shaped yoke collar
- U-turn
- U-turn for tyro
- U-turn from "fer"
- U-turn from "Give up!"
- U-turn from "I'm good"