Conclusion not quite so permanent (7)

I believe the answer is:

endless

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'quite so permanent' is the definition.
'endless' can be an answer for 'permanent' (I've seen this before). I am not certain of the 'quite so' bit.

'conclusion not' is the wordplay.
'conclusion' becomes 'end' (something's conclusion is its end).
'not' becomes 'less' (I've seen this in other clues).
'end'+'less'='ENDLESS'

Can you help me to learn more?

(Other definitions for endless that I've seen before include "Unceasing" , "no boundaries" , "Eternal - unbroken" , "without finishing" , "permanent" .)

I've seen this clue in The Mirror.

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