The most common and most likely answer to this crossword clue is the 4 letter word ASOF which also is the latest solution we found used in LA Times in 2019.
Effective on crossword clue answers
Here's a list of possible crossword answers ranked by the most likely to least likely.
| Answer | Likelyness | Letters | 
|---|---|---|
| ASOF | 100 % | 4 | 
Words with a meaning similar to the clue: Effective on
These words may or may not be a possible solution to this crosswords clue.- able
 - active
 - cogent
 - cost
 - count
 - effect
 - effectively
 - effectiveness
 - effects
 - efficacious
 - efficacy
 - efficiency
 
More crossword clues leading to the same solutions
Here's a few more crossword clues - all leading to the identical solution