Crossword Genius

A case of weapons making one nervous? (7)

Ross

I believe the answer is:

aquiver

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

'weapons making one nervous?' is the definition.
I can't tell whether this defines the answer.

'a case' is the wordplay.
'case' becomes 'quiver' (quiver is a kind of case).
'a'+'quiver'='AQUIVER'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for aquiver that I've seen before include "shuddering" , "far from steady" , "shaking" , "Trembling" , "Flickering" .)

I've seen this clue in The Times.
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