Need to trim the rowan tree (4)

I believe the answer is:

want

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'need to' is the definition.
(thesaurus)

'trim the rowan tree' is the wordplay.
'WANT' is hidden in amongst the letters.
However, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for want that I've seen before include "Need or desire" , "Crave" , "poverty" , "Desire - deficiency" , "Wish" .)

I've seen this clue in the Evening Standard.

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