Most willing to make the unsteady steadier? (8)

I believe the answer is:

readiest

'most willing' is the definition.
('ready' can be similar in meaning to 'willing')

'the unsteady steadier?' is the wordplay.
'the unsteady' indicates an anagram.
'steadier' with letters rearranged gives 'READIEST'.

'to make' acts as a link.

(Another definition for readiest that I've seen is " Steadier (anag.)".)

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