In Basildon, you can buy it at the supermarket (4)

I believe the answer is:

sild

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

'buy it at the supermarket' is the definition.
I can't tell whether this definition defines the answer.

'in basildon you' is the wordplay.
'in' says the answer is hidden in the clue.
'SILD' is hidden within 'basildon you'.

'can' acts as a link.

Can you help me to learn more?

(Other definitions for sild that I've seen before include "Young herring" , "Young fish" , "young swimmers" , "Small herring" .)

I've seen this clue in the Evening Standard.

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