Point thorn out (5)
I believe the answer is:
north
'point' is the definition.
(north is a kind of point)
'thorn out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'thorn' anagrammed gives 'NORTH'.
(Other definitions for north that I've seen before include "Cardinal compass point" , "One of four bridge players" , "Arctic" , "bridge player" , "who has to follow West's lead?" .)