Triumph clergyman found in bucket (7)
I believe the answer is:
prevail
'triumph' is the definition.
('prevail' can be a synonym of 'triumph')
'clergyman found in bucket' is the wordplay.
'clergyman' becomes 'rev' (I've seen this before).
'found in' indicates putting letters inside.
'bucket' becomes 'pail' ('pail' can be a synonym of 'bucket').
'rev' placed within 'pail' is 'PREVAIL'.
(Other definitions for prevail that I've seen before include "Prove more powerful" , "Triumph, overcome" , "Be victorious" , "Exist generally" , "Win through" .)