Get going when the fat man enters (5,3)
I believe the answer is:
start out
'get going' is the definition.
(I've seen this in another clue)
'the fat man enters' is the wordplay.
I cannot really understand how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
'man' could be 'art' and 'art' is present in the answer.
This explanation may well be incorrect...
'when' acts as a link.
Can you help me to learn more?
(Other definitions for start out that I've seen before include "Begin a journey" , "Take off" , "Go off" , "launch" , "hit the road" .)