Ready to fight for a dream? (5)

I believe the answer is:

armed

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

'ready to fight' is the definition.
(I've seen this in another clue)

'a dream?' is the wordplay.
'dream' can be anagrammed to 'ARMED'.
But, I am not sure how this is indicated.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for armed that I've seen before include "Given weapons" , "Being equipped with 25 Across" , "Bearing weapons" , "with Browning?" , "ready to fight" .)

I've seen this clue in the Evening Standard.

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