Crossword Genius

Perhaps fish with feet conform (3,3,4)

Ross

I believe the answer is:

toe the line

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'conform' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for toe the line that I've seen before include "Follow orders" , "Conform to expected requirements" , "when the heat is on?" , "Conform to expectations" , "Comply with authority" .)

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