Ape straddling an awning (6)
I believe the answer is:
canopy
'awning' is the definition.
(thesaurus)
'ape straddling an' is the wordplay.
'ape' becomes 'copy' ('copy' can be a synonym of 'ape').
'straddling' is an insertion indicator (straddle can mean to lie on both sides of).
'copy' going around 'an' is 'CANOPY'.
(Other definitions for canopy that I've seen before include "Hanging cover forming shelter over bed or throne" , "Covering against sun or rain" , "Uppermost branches of forest trees" , "Cockpit cover" , "Pay Con badly for the covering" .)