Always remaining calm? Not at all, with a puzzle like this (5,1,5,4)

'always remaining calm?' is the definition.
I know nothing about this answer so I can't tell whether this works.

'not at all with a puzzle like this' is the wordplay.
I cannot really understand how this works, but
'not' could be 'o' (I've seen this in other clues) and 'o' is found in the answer.
'with' could be 'w' (short for with) and 'w' is present in the answer.
'a' is present in the answer.
'like this' could be 'so' ('like so') and 'so' is located in the leftover letters.
'at all' could be 'ever' (I've seen this in another clue) and 'ever' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?