Denounce youth leader for spirit (6)
I believe the answer is:
brandy
'for spirit' is the definition.
(alcoholic spirit)
'denounce youth leader' is the wordplay.
'denounce' becomes 'brand' (synonyms).
'youth leader' becomes 'y' (I've seen this in other clues).
'brand'+'y'='BRANDY'
(Other definitions for brandy that I've seen before include "- - -snap" , "Alcoholic drink" , "warmer?" , "Cognac, perhaps" , "What a hero must drink, according to Dr Johnson" .)