Eg, nematode (4)

I believe the answer is:

worm

'eg nematode' is the definition.
(nematode is a kind of worm)

This is the entire clue.

(Other definitions for worm that I've seen before include "Screw thread; maggot" , "Creeping invertebrate" , "Long slender invertebrate" , "Despicable fellow" , "Wriggly creature" .)

I've seen this clue in The Times.

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