Flag: change motif, perhaps incorporating name (3,6)
I believe the answer is:
red ensign
'flag' is the definition.
(thesaurus)
'change motif perhaps incorporating name' is the wordplay.
'change motif perhaps' becomes 'redesign'.
'incorporating' is an insertion indicator.
'name' becomes 'n' (common abbreviation e.g. on forms).
'redesign' going around 'n' is 'RED ENSIGN'.
(Other definitions for red ensign that I've seen before include "Flag flown by the British Merchant Navy" , "It will fly at sea" , "standard for seamen" , "Sailor's flag" , "Flag for ships" .)