Point sort out of the poorest quality (5)
I believe the answer is:
worst
'of the poorest quality' is the definition.
(I've seen this before)
'point sort out' is the wordplay.
'point' becomes 'w' (W is an example).
'out' is an anagram indicator (out can mean wrong or inaccurate).
'sort' with letters rearranged gives 'orst'.
'w'+'orst'='WORST'
(Other definitions for worst that I've seen before include "Least competent" , "Strangely, best" , "Best; least good" , "Most unpleasant" , "Lowest of the low" .)