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Victim of robbery by The Pearly Queen? (6)

Ross

I believe the answer is:

oyster

I'm a little stuck... Click here to teach me more about this clue!

'victim of robbery' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'by the pearly queen?' is the wordplay.
'by' means one lot of letters go next to another.
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'pearly' becomes 'oys' (I can't explain this - if you can you should give a lot more credence to this answer).
'queen?' becomes 'ER' (abbreviation for Elizabeth Regina).
't' put after 'oys' is 'oyst'.
'oyst'+'er'='OYSTER'

Can you help me to learn more?

(Other definitions for oyster that I've seen before include "Source of pearl" , "Storey (anag)" , "Pearl-making mollusc" , "aphrodisiac?" , "Pearl-producing shellfish" .)

I've seen this clue in The Independent.
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