That caused by a pin in the wrong place? (4)
I believe the answer is:
pain
'the wrong place?' is the definition.
The answer and definition can be both related to thinking as well as being singular nouns.
Maybe there's an association between them I don't understand?
'that caused by a pin' is the wordplay.
'that caused' is an anagram indicator (I've seen 'causing' mean this).
'by' says to put letters next to each other.
'a' after 'pin' is 'pina'.
'pina' anagrammed gives 'PAIN'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for pain that I've seen before include "nuisance to be put up with" , "can cause discomfort" , "Tiresome figure" , "Unpleasant sensation" , "Agony" .)