A singular sense about withdrawn approval (6)

I believe the answer is:

assent

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'withdrawn approval' is the definition.
'assent' can be an answer for 'approval' (I've seen this in another clue). I am not certain of the 'withdrawn' bit.

'a singular sense' is the wordplay.
'singular' becomes 's' (abbreviation in grammar).
'sense' becomes 'sent' (I can't explain this - if you can you should give a lot more credence to this answer).
'a'+'s'+'sent'='ASSENT'

'about' acts as a link.

Can you help me to learn more?

(Other definitions for assent that I've seen before include "Accede, agree" , "Acquiescence" , "Permit or approve" , "Say yes" , "Agree and concur" .)

I've seen this clue in The Times.

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