Determine content of crude cider (6)
I believe the answer is:
decide
'determine' is the definition.
(synonyms)
'content of crude cider' is the wordplay.
'content of' says the answer is hidden in the clue.
'DECIDE' can be found hidden inside 'crude cider'.
(Other definitions for decide that I've seen before include "Come to a resolution" , "Settle conclusively" , "Make up one's mind" , "Resolve; give judgement" , "Reach a judgment" .)