5 down
Their
responsibility
to
send
one
back
to
France
is
being
served
(2,3,4)
Their responsibility to send one back to France is being served (2,3,4)
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The definition is at the end of the clue.
How the clue works
The definition is being served, as something that's on the menu is available to be served. The wordplay starts with "on them" meaning "their responsibility" (as in "it's on them"), giving ON THEM. Then "one" in French is UNE, and "send back" tells us to reverse it, giving ENU. Put them together — ON THEM + ENU — and you get ON THE MENU.