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Perfectionist provided ultimately faultless puzzle (8)

Ross

I believe the answer is:

stickler

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'perfectionist' is the definition.
(as in a stickler for the rules)

'ultimately faultless puzzle' is the wordplay.
'ultimately faultless' becomes 's' (I can't explain this - if you can you should believe this answer much more).
'puzzle' becomes 'tickler' (I've seen this before).
's'+'tickler'='STICKLER'

'provided' acts as a link.

Can you help me to learn more?

(Other definitions for stickler that I've seen before include "Nit-picker" , "Trickles for someone who insists" , "Particular person" , "One who insists on something, like punctuality" , "I may do that precisely" .)

I've seen this clue in The Telegraph.
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