Crossword Genius

And he swims in to land when you give assistance (4,1,4)

Ross

I believe the answer is:

lend a hand

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'give assistance' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for lend a hand that I've seen before include "Turn to and help" , "Provide help" , "Pitch in" , "Give assistance" , "temporarily transfer an employee" .)

I've seen this clue in the Evening Standard.
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