Crossword Genius

Host works in secret larvae (4,5)

Ross

I believe the answer is:

army worms

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

'larvae' is the definition.
(army worm is a kind of larva)

'host works in secret' is the wordplay.
'host' becomes 'army' (I've seen this in other clues).
'works in secret' becomes 'worms' (I can't explain this - if you can you should give a lot more credence to this answer).
'army'+'worms'='ARMY WORMS'

Can you help me to learn more?

(Another definition for army worms that I've seen is " They'll destroy my crops".)

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