Sense good deal (5)
I believe the answer is:
sight
This clue is a double definition.
'sense' is the first definition.
(sighting is a kind of sensing)
'good deal' is the second definition.
(I've seen this before)
(Other definitions for sight that I've seen before include "Vista" , "Bodily faculty" , "A lot" , "Place worth visiting" , "good deal" .)