One of two needed for double Dutch (4)
I believe the answer is:
rope
'one of two needed for double dutch' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rope that I've seen before include "String of pearls, say" , "Enough to hang one?" , "Hitch" , "Noose" , "Money for old . . . . Is easily earned" .)