5 down
Chum
accommodating
one
relation,
not
gross,
in
apartment
(11)
Chum accommodating one relation, not gross, in apartment (11)
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The definition is at the end of the clue.
How the clue works
Look at apartment at the end — that's your definition, a maisonnette being a small flat. MATE (chum) "accommodates" (contains) the following: I (one), then SON (relation), then NETT (not gross, as in the financial sense), slotting them all inside MATE to give you MA+I+SON+NETT+E.