Crossword Genius

A large provision of weapons is causing panic (8)

Ross

I believe the answer is:

alarming

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

'weapons is causing panic' is the definition.
I can't tell whether this definition defines the answer.

'a large provision' is the wordplay.
'large' becomes 'L' (eg in clothes sizes).
'provision' becomes 'arming' (I can't justify this - if you can you should believe this answer much more).
'a'+'l'+'arming'='ALARMING'

'of' is the link.

Can you help me to learn more?

(Other definitions for alarming that I've seen before include "causing fright" , "Worrying or disturbing" , "Dangerous" , "Marginal (anag)" , "Scary, frightening" .)

I've seen this clue in The Independent.
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