Distress over large insect found in banana (8)
I believe the answer is:
plantain
'banana' is the definition.
(plantain is a kind of banana)
'distress over large insect' is the wordplay.
'distress' becomes 'pain' (I've seen this before**).
'over' is an insertion indicator.
'large' becomes 'l'.
'insect' becomes 'ant' (ant is a kind of insect).
'l'+'ant'='lant'
'pain' placed around 'lant' is 'PLANTAIN'.
'found in' is the link.
(Other definitions for plantain that I've seen before include "Tropical food" , "Large banana - weed" , "Green-skinned banana" , "Coarse banana" , "Pal at inn (anag)" .)