Pair of the French get nothing (3)
I believe the answer is:
Here is my best explanation:
'pair' is the definition.
(duo is a kind of pair)
'of the french get nothing' is the subsidiary indication.
'of the french' becomes 'du'.
'get' is a charade indicator (letters next to each other).
'nothing' becomes 'o' (looks like zero - 0).
(Other definitions for duo that I've seen before include "rejected Arab's lute", "Pair of performers", "Music for two", "Pair (of people, things)", "A team of two", "Pair of people/things", "Brace", "A pair of performers", "Performers" and "Two players".)