Ring any number in locality (5)
I believe the answer is:
arena
'ring' is the definition.
(thesaurus)
'any number in locality' is the wordplay.
'any number' becomes 'n' (I've seen this in other clues).
'in' means one lot of letters goes inside another.
'locality' becomes 'area' (I've seen this before).
'n' put inside 'area' is 'ARENA'.
(Other definitions for arena that I've seen before include "Show ring" , "Scene of open conflict" , "Battleground" , "Entertainments venue" , "park" .)