Crossword Genius

Wooden crown is no good to Peter (7)

Ross

I believe the answer is:

treetop

'wooden crown' is the definition.
(the top or 'crown' of a tree)

'no good to peter' is the wordplay.
'no good' indicates an anagram (no good can mean faulty or defective).
'to'+'peter'='topeter'
'topeter' is an anagram of 'TREETOP'.

'is' acts as a link.

(Other definitions for treetop that I've seen before include "Highest branch location" , "High point of a plane, for example" , "To Peter (anag)" , "` `Rockaby baby on a .......' '" , "for baby, a rocky situation" .)

I've seen this clue in The Guardian.
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