Plait, intertwine (5)
I believe the answer is:
braid
I believe this clue is a double definition.
'plait' is the first definition.
(synonyms)
'intertwine' is the second definition.
(I've seen this before)
(Other definitions for braid that I've seen before include "Decorative band for trimming" , "Plaited length, of hair say." , "Intertwine (hair)" , "decoration" , "As before, reproach" .)