Crossword Genius

Remove irons and sunbake on a cock feather (9)

Ross

I believe the answer is:

unshackle

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

'remove irons and sunbake' is the definition.
I can't judge whether this defines the answer.

'on a cock feather' is the wordplay.
'on' says to put letters next to each other.
'a cock' becomes 'uns' (I can't explain this - if you can you should give a lot more credence to this answer).
'feather' becomes 'hackle' (hackle is a kind of feather).
'uns' next to 'hackle' is 'UNSHACKLE'.

Can you help me to learn more?

(Other definitions for unshackle that I've seen before include "Set free from bonds" , "Release from chains" .)

I've seen this clue in the Sydney Morning Herald.
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