Cab rank relocated behind small food outlet (5,3)
I believe the answer is:
snack bar
'food outlet' is the definition.
(snack bar is a type of food outlet)
'cab rank relocated behind small' is the wordplay.
'relocated' is an anagram indicator.
'behind' means one lot of letters go next to another.
'small' becomes 's' (abbreviation - e.g. clothes size).
'cab'+'rank'='cabrank'
'cabrank' with letters rearranged gives 'nackbar'.
'nackbar' after 's' is 'SNACK-BAR'.
(Other definitions for snack bar that I've seen before include "Place where light meals may be had" , "Small cafe" , "Place to buy light meals" , "Lyons, once?" , "Place to obtain light refreshments" .)