Such weapons could give us grain (7)

I believe the answer is:

airguns

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'such weapons' is the definition.
'airguns' can be an answer for 'weapons' (airgun is a kind of weapon). I'm not certain of the 'such' bit.

'give us grain' is the wordplay.
'give' indicates anagramming the letters (I've seen 'giving' mean this (the letters give the letters for another word)).
'us'+'grain'='usgrain'
'usgrain' with letters rearranged gives 'AIRGUNS'.

'could' acts as a link.

Can you help me to learn more?

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

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