City's smaller relative (4)
I believe the answer is:
town
'city's smaller relative' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for town that I've seen before include "SECOND PART OF 17" , "Milton Keynes, say, with 1a [NEW]" , "Small urban development" , "eg Swindon" , "more established area with 1a [OLD]" .)