Bad weeks, the butcher concludes, can have a useful point! (6)
I believe the answer is:
skewer
'point' is the definition.
(thesaurus)
'bad weeks the butcher concludes can have a useful' is the wordplay.
I cannot quite see how this works, but
an anagram of 'weeks' is 'skewe' which is located in the answer.
A single letter 'r' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for skewer that I've seen before include "Spear" , "Stick on which kebab is cooked" , "Long metal pin" , "Metal spit" , "Criticise pointedly" .)