Half your collar turned up in town (5)
I believe the answer is:
urban
'in town' is the definition.
(I've seen this before)
'half your collar turned up' is the wordplay.
'half' indicates taking half.
'collar' becomes 'nab' (both can mean to catch a person).
'turned up' says the letters should be written backwards.
'nab' in reverse letter order is 'ban'.
'your' with half the letters taken is 'ur'.
'ur'+'ban'='URBAN'
(Other definitions for urban that I've seen before include "City - pope" , "Relating to city life" , "Of or about city areas" , "Relating to built-up areas" , "Had this description of town" .)