Betraying opinion, stifling question identifying consumer requirement? (8,6)

I believe the answer is:

shopping basket

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'consumer requirement?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'betraying opinion stifling question' is the wordplay.
'betraying' becomes 'shopping' (I can't justify this - if you can you should give a lot more credence to this answer).
'opinion' becomes 'bet' (I've seen this in other clues).
'stifling' means one lot of letters goes inside another.
'question' becomes 'ask'.
'bet' going around 'ask' is 'basket'.
'shopping'+'basket'='SHOPPING BASKET'

'identifying' acts as a link.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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