Matching a nice colour (7)
I believe the answer is:
kindred
'matching' is the definition.
(thesaurus)
'a nice colour' is the wordplay.
'a nice' becomes 'kind' (I've seen this before).
'colour' becomes 'red' (red is a kind of colour).
'kind'+'red'='KINDRED'
(Other definitions for kindred that I've seen before include "Family - like" , "Similarity in character" , "Related by blood - having similar qualities" , "Related by blood or marriage" , "clan" .)