Escaping notice, you understand, in nun's disguise (6)

I believe the answer is:

unseen

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'escaping notice' is the definition.
I can't tell whether this defines the answer.

'understand in nun's disguise' is the wordplay.
'understand' becomes 'see' (synonyms).
'in' indicates putting letters inside.
'disguise' is an anagram indicator (I've seen 'disguising' mean this).
'nun' with letters rearranged gives 'unn'.
'see' going within 'unn' is 'UNSEEN'.

'you' is the link.

Can you help me to learn more?

(Other definitions for unseen that I've seen before include "Concealed" , "Invisible or not observed" , "Not noticed" , "Translation exercise" , "Unobserved" .)

I've seen this clue in the Evening Standard.

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