Avoid getting hot in the summer heat (4)
I believe the answer is:
shun
'avoid' is the definition.
(I know that shun is a more specific form of the action avoid)
'hot in the summer heat' is the wordplay.
'hot' becomes 'h' (abbreviation, eg on taps).
'in the' is an insertion indicator.
'summer heat' becomes 'sun' (I can't explain this - if you can you should give a lot more credence to this answer).
'h' placed within 'sun' is 'SHUN'.
'getting' acts as a link.
Can you help me to learn more?
(Other definitions for shun that I've seen before include "Persistently ignore" , "Spurn; avoid" , "military command" , "Keep away from Huns" , "Persistently reject" .)