17 down
Fraction
outside
of
second,
swimmer
pushing
hard?
(8)
Fraction outside of second, swimmer pushing hard? (8)
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The definition is at the end of the clue.
How the clue works
Right, so pushing hard? at the end is what we're defining — that's JOSTLING. Take JOT, meaning a fraction or tiny amount, and wrap it round S (short for second), giving you JO-S-T. Then tack on LING, which is your swimmer here — a fish — and the whole lot builds JOSTLING.