Perhaps taste delicatessen's egg sandwiches (5)
I believe the answer is:
sense
'perhaps taste' is the definition.
(I know that gustation is a type of modality)
'delicatessen's egg sandwiches' is the wordplay.
'sandwiches' says the answer is hidden in the clue (the answer is sandwiched in by the clue).
'SENSE' can be found hidden inside 'delicatessens egg'.
(Other definitions for sense that I've seen before include "definition" , "Divine" , "Reason; perceive" , "Perceive - feeling" , "Meaning - feeling" .)