Crossword Genius

The poor fish that does so is apt to get caught (5)

Ross

I believe the answer is:

rises

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

'apt to get caught' is the definition.
I can't judge whether this definition defines the answer.

'the poor fish that does so is' is the wordplay.
I cannot really see how this works, but
'is' is present in the answer.
The remaining letters 'res' 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 rises that I've seen before include "Moves upwards" , "Gets up" , "Ascends" , "Moves upward" , "Comes or goes upward" .)

I've seen this clue in the Evening Standard.
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