Hold good bucket that vicar fills (7)
I believe the answer is:
prevail
'hold' is the definition.
(synonyms)
'good bucket that vicar fills' is the wordplay.
'good bucket' becomes 'pail' (synonyms. I am not sure about the 'good' bit.).
'that vicar' becomes 'rev' (short for reverend).
'fills' indicates putting letters inside (one set of letters goes inside another).
'pail' going around 'rev' is 'PREVAIL'.
Can you help me to learn more?
(Other definitions for prevail that I've seen before include "Be current" , "Gain mastery" , "Triumph, overcome" , "Carry the day" , "Prove more powerful" .)