They get fired by a major supplier for concealing what's in farm subsidies (4)

I believe the answer is:

arms

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'they get fired by a major supplier for concealing' is the definition.
The definition suggests an adverb but the answer is not.

'in farm subsidies' is the wordplay.
'in' indicates a hidden word.
'ARMS' can be found hidden inside 'farm subsidies'.

'what's' is the link.

Can you help me to learn more?

(Other definitions for arms that I've seen before include "See 12" , "Arsenal's items?" , "you'll find in the gunroom" , "Members" , "pacifists won't take up" .)

I've seen this clue in The Irish Times.

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