Award for pub in old city (6)
I believe the answer is:
trophy
'award' is the definition.
(I know that trophy is a type of award)
'pub in old city' is the wordplay.
'pub' becomes 'ph' (public house).
'in' means one lot of letters goes inside another.
'old city' becomes 'Troy' (ancient city).
'ph' inserted inside 'troy' is 'TROPHY'.
'for' acts as a link.
(Other definitions for trophy that I've seen before include "Laurels" , "Object symbolising success" , "leading award" , "Object awarded as token of victory" , "Prize of war" .)