Crossword Genius

East End shopkeeper shows material for basket? (5)

Ross

I believe the answer is:

osier

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

This clue could be a double definition.

'east end shopkeeper' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'material for basket?' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'shows' is the link.

Can you help me to learn more?

(Other definitions for osier that I've seen before include "Willow for basket making" , "Basket-making material" , "branch" , "Basket material" , "Tree - Rosie (anag)" .)

I've seen this clue in The Times.
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