Stares stupidly at bunch of fruit, having no resistance (5)
I believe the answer is:
gapes
'stares stupidly at' is the definition.
'bunch of fruit having no resistance' is the wordplay.
'bunch of fruit' becomes 'grapes'.
'having no' indicates named letters should be taken away.
'resistance' becomes 'r' (abbreviation).
'grapes' with 'r' removed is 'GAPES'.
(Other definitions for gapes that I've seen before include "Stares at with mouth wide open" , "goggles" , "Yawns" , "Opens mouth wide in surprise" , "Looks on with open mouth" .)