Triumph dropping vicar into bucket (7)
I believe the answer is:
prevail
'triumph' is the definition.
(synonyms)
'vicar into bucket' is the wordplay.
'vicar' becomes 'rev'.
'into' means one lot of letters goes inside another.
'bucket' becomes 'pail' (synonyms).
'rev' going into 'pail' is 'PREVAIL'.
'dropping' acts as a link.
This may not be right. It may be part of another bit of the clue.
(Other definitions for prevail that I've seen before include "Be widespread; prove superior" , "Get one's way" , "Be victorious" , "Succeed ultimately" , "Be current" .)