Rhine town's maggots? (5)

I believe the answer is:

worms

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'maggots?' is the definition.
The answer and definition can be both animals as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for worms that I've seen before include "Early birds' diet" , "Where reformer was condemned" , "Long soft-bodied limbless invertebrates" , "despicable people" , "harmful programs" .)

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

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