Avoid getting hot in blazer (4)
I believe the answer is:
shun
'avoid' is the definition.
(I've seen this before)
'hot in blazer' is the wordplay.
'hot' becomes 'h'.
'in' is an insertion indicator.
'blazer' becomes 'sun' (I've seen this in other clues).
'h' placed into 'sun' is 'SHUN'.
'getting' acts as a link.
(Other definitions for shun that I've seen before include "Parade-ground language" , "Avoid - attention!" , "Persistently avoid" , "Keep away from, have nothint to do with" , "Deliberately have no contact with" .)