Crossword Genius

Can this possibly prohibit injecting drug? (4)

Ross

I believe the answer is:

bean

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'can this' is the definition.
The definition suggests a singular noun which matches the answer. I also know that 'can' relates to this answer.

'prohibit injecting drug?' is the wordplay.
'prohibit' becomes 'ban' (banning is a kind of prohibiting).
'injecting' means one lot of letters goes inside another.
'drug?' becomes 'e' (E is another name for ecstasy).
'ban' going around 'e' is 'BEAN'.

'possibly' is the link.

Can you help me to learn more?

(Other definitions for bean that I've seen before include "Fava, kidney or mung, say" , "Seed; head" , "Vegetable; coffee seed" , "Nut" , "Haricot, for example" .)

I've seen this clue in The Independent.
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