Dry vinegar? Ideal for some! (4)
I believe the answer is:
arid
'dry' is the definition.
(similar in meaning)
'vinegar? ideal for some' is the wordplay.
'some' indicates a hidden word.
'ARID' is hidden in the letters of 'vinegar ideal for'.
(Other definitions for arid that I've seen before include "Very dry, having little rain" , "Dry and parched, as with regions" , "Without much rainfall" , "Parched, waterless" , "Dry and infertile" .)