Crossword Genius

Which fish can sway rod or pole? (4,5)

Ross

I believe the answer is:

rock perch

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

'which fish' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'sway rod or pole?' is the wordplay.
I cannot really understand how this works, but
'sway' could be 'rock' (synonyms) and 'rock' is found in the answer.
'rod' could be 'perch' (synonyms) and 'perch' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

'can' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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