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Persistent, sure-footed, fast? Not so much! (10)

Ross

I believe the answer is:

relentless

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

'persistent' is the definition.
(I know that persistent can be written as relentless)

'sure-footed fast? not so much' is the wordplay.
'sure footed fast?' becomes 'relent' (I can't explain this - if you can you should give a lot more credence to this answer).
'not so much' becomes 'less' (I've seen this in another clue).
'relent'+'less'='RELENTLESS'

Can you help me to learn more?

(Other definitions for relentless that I've seen before include "sustained" , "Uncompromising" , "Allowing no respite" , "Inexorable" , "Dogged" .)

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