Lively activity seen around a new Scots town (6)
I believe the answer is:
lanark
'scots town' is the definition.
(I've seen this before)
'lively activity seen around a new' is the wordplay.
'lively activity' becomes 'lark' (**).
'seen around' means one lot of letters goes inside another.
'a new' becomes 'an' (I've seen this in other clues).
'lark' placed around 'an' is 'LANARK'.
(Other definitions for lanark that I've seen before include "town in Scotland" , "Scots town" , "Scottish town" .)