21 across
Brought
a
bit
of
fun
to
number,
as
it
happens,
in
desperate
need
(9)
Brought a bit of fun to number, as it happens, in desperate need (9)
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The definition is at the beginning of the clue.
How the clue works
The definition here is Brought a bit of fun to. Take N for 'number' and LIVE for 'as it happens', then tuck them inside an anagram (signalled by 'desperate') of NEED, which unfolds as E and NED around the inserted letters to give ENLIVENED.