Answer is to tuck into meal to get going (6)
I believe the answer is:
launch
'get going' is the definition.
(thesaurus)
'answer is to tuck into meal' is the wordplay.
'answer' becomes 'a' (abbreviation eg in Q and A).
'is to tuck into' is an insertion indicator.
'meal' becomes 'lunch' (lunch is a kind of meal).
'a' placed within 'lunch' is 'LAUNCH'.
'to' acts as a link.
(Other definitions for launch that I've seen before include "(Send) motor-boat (into the water)" , "Set on course, new ship or book" , "Begin (a project)" , "Send on its course, new ship or publication" , "Begin; motor boat" .)