Crossword Genius

Succinct poem needs new beginning (5)

Ross

I believe the answer is:

terse

'succinct' is the definition.
(thesaurus)

I don't understand how the rest of the clue works.

(Other definitions for terse that I've seen before include "Reset to be pithy" , "Brief and to the point" , "Trees (anag.)" , "Abrupt, concise" , "Succinct about trees" .)

I've seen this clue in The Times.
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