Ascending green warbler channels strength (5)

I believe the answer is:

brawn

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

'strength' is the definition.
(I know that brawn is a type of strength)

'ascending green warbler channels' is the wordplay.
'BRAWN' is hidden backwards within the letters.
However, I'm unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for brawn that I've seen before include "Jellied meat - muscle" , "This is strong" , "Strength; a jellied loaf" , "Beefiness" , "Physical strength; cooked meat" .)

I've seen this clue in The Independent.

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