Food shop I ran in retirement (4)
I believe the answer is:
deli
'food shop' is the definition.
(short for delicatessen)
'i ran in retirement' is the wordplay.
'ran' becomes 'led' ('lead' can be a synonym of 'run').
'in retirement' says the letters should be written backwards (retire can mean to go back or backwards).
'i'+'led'='iled'
'iled' written backwards gives 'DELI'.
(Other definitions for deli that I've seen before include "Specialised food shop" , "Food store" , "Fine-food store" , "Seller of unusual foods" , "Special shop" .)