Angler's unwanted BBQ item? (4)
I believe the answer is:
snag
'item?' is the definition.
The definition and answer can be both related to thinking as well as being singular nouns.
Maybe they are linked in a way I don't understand?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for snag that I've seen before include "Catch - disadvantage" , "Minor problem" , "Jagged projection" , "Hidden obstacle or drawback" , "Problem or drawback" .)