Cover from sun's heat here (7)
I believe the answer is:
sheathe
'cover' is the definition.
(sheathing is a kind of covering)
'from sun's heat here' is the wordplay.
'from' says the answer is hidden in the clue.
'SHEATHE' is hidden in the letters of 'suns heat here'.
(Other definitions for sheathe that I've seen before include "Put (a sword) into case" , "Put (a sword) it its cover" , "Cover in case" , "Protective cover, for sword say" , "Put away (a sword)" .)