Crossword Genius

LSD (4)

Ross

I believe the answer is:

acid

'lsd' is the definition.
(synonyms)

This is all the clue.

(Other definitions for acid that I've seen before include "It is neutralised by alkali" , "Sour - type of rain or drop" , "Sour - LSD" , "Morose" , "See 4 Across" .)

I've seen this clue in the USA Today, the LA Times and the Universal.
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