Look forward to a Joker, accepting answer (5)
I believe the answer is:
await
'look forward to' is the definition.
(synonyms)
'a joker accepting answer' is the wordplay.
'joker' becomes 'wit' (a witty person).
'accepting' means one lot of letters goes inside another.
'answer' becomes 'a' (abbreviation eg in Q and A).
'wit' enclosing 'a' is 'wait'.
'a'+'wait'='AWAIT'
(Other definitions for await that I've seen before include "Look forward to" , "Be ready for" , "Remain in expectation for (an occurrence)" , "Look for (something to happen)" , "Expect, anticipate" .)