Pair, duo (7)
I believe the answer is:
twosome
I believe this clue is a double definition.
'pair' is the first definition.
(I know that pair can be written as twosome)
'duo' is the second definition.
(I know that duo can be written as twosome)
(Other definitions for twosome that I've seen before include "game of golf" , "Couple" , "Item" , "match" , "Pair, duo" .)