Crossword Genius

Some, at end, must be fodder for worms (9)

Ross

I believe the answer is:

nematodes

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

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

'some at end must be fodder' is the wordplay.
'some at end' can be anagrammed to 'NEMATODES'.
But, I'm not sure how the anagram is indicated.

'for' is the link.

Can you help me to learn more?

I've seen this clue in The Telegraph.
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