Crossword Genius

A revolutionary painting is call to arms (6)

Ross

I believe the answer is:

alarum

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

'call to arms' is the definition.
I can't tell whether this definition defines the answer.

'a revolutionary painting' is the wordplay.
'revolutionary' shows that the letters should be reversed in order.
'painting' becomes 'mural' (mural is a kind of painting).
'mural' back-to-front is 'larum'.
'a'+'larum'='ALARUM'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for alarum that I've seen before include "commotion" , "Warning sound" , "Warning bell (archaic)" , "conflict" , "disturbance" .)

I've seen this clue in The Independent.
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