Bloke, hot, better going outside (4)
I believe the answer is:
chap
'bloke' is the definition.
(I've seen this before)
'hot better going outside' is the wordplay.
'hot' becomes 'h'.
'better going' becomes 'cap' (I am not sure about this - if you are sure you should believe this answer much more).
'outside' means one lot of letters goes inside another.
'h' placed within 'cap' is 'CHAP'.
Can you help me to learn more?
(Other definitions for chap that I've seen before include "(Of skin) become sore" , "Become sore; fellow" , "Split in skin" , "we prefer not to have on hand" , "Bloke, fellow" .)