Crossword Genius

Drifting, it's a danger to swimmers (3)

Ross

I believe the answer is:

net

I'm a little stuck... Click here to teach me more about this clue!

'drifting' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

'it's a danger to swimmers' is the wordplay.
I cannot quite see how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is present in the answer.
The remaining letters 'ne' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for net that I've seen before include "What separates court opponents" , "Open-meshed material (used for catching things?)" , "Catch -- after all deductions" , "After expenses" , "Mesh; profit" .)

I've seen this clue in the Evening Standard.
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