Food on either side of street trail (5)
I believe the answer is:
piste
'trail' is the definition.
(thesaurus)
'food on either side of street' is the wordplay.
'food' becomes 'pie' (pie is a kind of food).
'on either side of' is an insertion indicator.
'street' becomes 'st'.
'pie' enclosing 'st' is 'PISTE'.
(Other definitions for piste that I've seen before include "Skiing trail" , "Ski slope" , "Skiing run" , "Ski-slope" , "Skiing course" .)