Data belonging to part of UK turned up (4)
I believe the answer is:
info
'data' is the definition.
(thesaurus)
'belonging to part of uk turned up' is the wordplay.
'belonging to' becomes 'of' (I've seen this in other clues).
'part of uk' becomes 'ni' (Northern Ireland).
'turned up' shows that the letters should be reversed in order.
'of'+'ni'='ofni'
'ofni' reversed gives 'INFO'.
(Other definitions for info that I've seen before include "Data (abbrev.)" , "Data received and understood (abbr)" , "Gen (abbr)" , "Dope" , "Latest" .)