She is not quite of the usual standard (5)

I believe the answer is:

norma

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'she' is the definition.
(I've seen this before)

'not quite of the usual standard' is the wordplay.
'not quite of' means to remove the last letter (I've seen 'not quite' mean this).
'the usual' becomes 'norm' (I've seen this in another clue).
'standard' becomes 'ma' (I can't justify this - if you can you should give a lot more credence to this answer).
'norm' with its final letter taken away is 'nor'.
'nor'+'ma'='NORMA'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for norma that I've seen before include "Female" , "Opera - ex-PM's wife" , "John Major's wife - Bellini opera" , "Marilyn Monroe's real first name" , "Game; shared supply" .)

I've seen this clue in The Irish Independent.

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