Man with groom redesigned motif of interwoven letters (8)
I believe the answer is:
monogram
'motif of interwoven letters' is the definition.
(I've seen this before)
'man with groom redesigned' is the wordplay.
'with' means one lot of letters go next to another.
'redesigned' indicates an anagram.
'man'+'groom'='mangroom'
'mangroom' with letters rearranged gives 'MONOGRAM'.
(Other definitions for monogram that I've seen before include "Motif of interwoven letters" , "Embroidered motif" , "union of characters" , "Type of Personal Identification" , "A person's initials combined in one design" .)