Begin meal around start of afternoon (6)
I believe the answer is:
launch
'begin' is the definition.
(I've seen this before)
'meal around start of afternoon' is the wordplay.
'meal' becomes 'lunch' (lunch is a kind of meal).
'around' indicates putting letters inside.
'start of afternoon' becomes 'a' (I am not sure about this - if you are sure you should believe this answer much more).
'lunch' placed around 'a' is 'LAUNCH'.
Can you help me to learn more?
(Other definitions for launch that I've seen before include "Send out; motor boat" , "Start - motor-driven boat" , "Initiate; a boat" , "Inaugurate" , "Of ship, formally set afloat" .)