Bird that does not fly in summer heat (4)
I believe the answer is:
rhea
'bird that does not fly' is the definition.
'rhea' can be an answer for 'bird' (rhea is a kind of bird). I am not sure about the remainder of the definition.
'in summer heat' is the wordplay.
'in' says the answer is hidden in the clue.
'RHEA' is hidden within 'summer heat'.
Can you help me to learn more?
(Other definitions for rhea that I've seen before include "Ostrich-like bird - satellite of Saturn" , "South American bird resembling the ostrich" , "South American flightless bird - mother of Zeus" , "S. Amer. flightless bird" , "New World ostrich" .)