Crossword Genius

Tree healthier-looking after being pollarded? (5)

Ross

I believe the answer is:

osier

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'tree' is the definition.
(osier is a kind of tree)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for osier that I've seen before include "Tree - Rosie (anag)" , "Basket producer" , "Twig used in basket-making" , "Basketry willow" , "one used to get weaving?" .)

I've seen this clue in The Telegraph.
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