Reported quick look in summit (4)
I believe the answer is:
peak
'summit' is the definition.
(mountain peak)
'reported quick look' is the wordplay.
'reported' shows a homophone (sound like).
'quick look' becomes 'peek' (I've seen this in another clue).
'peek' sounds like 'PEAK'.
'in' is the link.
(Other definitions for peak that I've seen before include "Summit, often pointed" , "Tip" , "Pinnacle" , "Sharp pointed summit" , "maximum pitch" .)