27 across
Put
off
deciding
what
to
do
with
a
chair
(3,2,2)
Put off deciding what to do with a chair (3,2,2)
hints
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checks
0
hints
The whole clue is the definition (& lit or double definition).
How the clue works
Put off deciding what to do is your definition — to sit on it means to delay making a decision — and the lovely bit is that with a chair gives you the same phrase literally, since that's exactly what you do with a chair.