Ignorant of Stubbs? We must embrace timeless art (7)

I believe the answer is:

unaware

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'ignorant of' is the definition.
(not aware of something)

'stubbs? we must embrace timeless art' is the wordplay.
'stubbs?' becomes 'Una' (actress Una Stubbs is an example).
'must embrace' means one lot of letters goes inside another.
'timeless art' becomes 'ar' (I can't justify this - if you can you should give a lot more credence to this answer).
'we' going around 'ar' is 'ware'.
'una'+'ware'='UNAWARE'

Can you help me to learn more?

(Other definitions for unaware that I've seen before include "In the dark" , "Heedless" , "Not cognisant" , "Uninformed" , "Not realising" .)

I've seen this clue in The Telegraph.

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