Accuse him while blowing top over fruit (7)
I believe the answer is:
impeach
'accuse him while' is the definition.
'impeach' can be an answer for 'accuse' (impeaching is a kind of accusing). I am unsure of the 'him while' bit.
'blowing top over fruit' is the wordplay.
'blowing top over' becomes 'im' (I can't justify this - if you can you should believe this answer much more).
'fruit' becomes 'peach' (type of fruit).
'im'+'peach'='IMPEACH'
Can you help me to learn more?
(Other definitions for impeach that I've seen before include "Disparage" , "Bring a charge against" , "In America, charge with misconduct - say President" , "Charge a public official with an offence" , "Charge with a crime (against the state)" .)