Banana-like fruit left worker in agony (8)
I believe the answer is:
plantain
'banana-like fruit' is the definition.
(I've seen this before)
'left worker in agony' is the wordplay.
'left' becomes 'l' (common abbreviation).
'worker' becomes 'ant' (worker is a type of ant).
'in' means one lot of letters goes inside another.
'agony' becomes 'pain' (I've seen this before).
'l'+'ant'='lant'
'lant' inserted into 'pain' is 'PLANTAIN'.
(Other definitions for plantain that I've seen before include "Low-growing plant; type of banana" , "Banana-like fruit" , "Pal at inn (anag)" , "Cooking banana" , "Tropical food" .)