15 down
A
rush
coming
through
ocean
water
–
that
resembles
grass
(9)
A rush coming through ocean water – that resembles grass (9)
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The definition is at the end of the clue.
How the clue works
That resembles grass is your definition — think artificial turf. Take A, then drop TROT (rush) inside SURF (ocean water) to get A + S-TROT-URF, and there's your nine-letter answer.