After Bill, my French is hard to criticise (8)
I believe the answer is:
admonish
'criticise' is the definition.
(admonishing is a kind of criticizing)
'after bill my french is hard' is the wordplay.
'after' says to put letters next to each other.
'bill' becomes 'ad' (advertisement stuck on wall).
'my french' becomes 'mon'.
'hard' becomes 'h'.
'ad'+'mon' is 'admon'.
'admon'+'is'+'h'='ADMONISH'
'to' acts as a link.
(Other definitions for admonish that I've seen before include "Gently reprove" , "Scold, wag the finger at" , "Tell off" , "criticise" , "Chide, reprove" .)