Ready to fight for a possible 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 possible dream' is the wordplay.
'dream' anagrams to 'ARMED'.
However, I am not clear how the anagram is indicated.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for armed that I've seen before include "Equipped with weapons" , "equipped for fighting" , "Like Mars" , "Prepared for battle" , "With a piece" .)

I've seen this clue in the Evening Standard.

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