Crossword Genius

Handle some poems about mobile worms (10)

Ross

I believe the answer is:

trematodes

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

'worms' is the definition.
(I know that fluke is a type of worms)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

I've seen this clue in The Independent.
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