Bloomer left social worker in agony (8)
I believe the answer is:
plantain
'bloomer' is the definition.
'left social worker in agony' is the wordplay.
'left' becomes 'l' (common abbreviation).
'social worker' becomes 'ant' (I've seen this before).
'in' is an insertion indicator.
'agony' becomes 'pain' (I've seen this before).
'l'+'ant'='lant'
'lant' inserted within 'pain' is 'PLANTAIN'.
(Other definitions for plantain that I've seen before include "Tropical plant like a banana" , "Sort of banana" , "Green-skinned banana" , "Tropical food" , "Low-growing plant; type of banana" .)