Glue on strap to provide extra strength (13)
I believe the answer is:
reinforcement
'extra strength' is the definition.
The answer and definition can be both related to thinking as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'glue on strap to' is the wordplay.
I cannot really understand how this works, but
'glue' could be 'cement' (I've seen this in another clue) and 'cement' is found within the answer.
'on' could be 're' ('on' can be mean 'with reference to') and 're' is found within the answer.
'to' could be 'for' and 'for' is present in the answer.
The remaining letters 'in' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'provide' is the link.
Can you help me to learn more?
(Other definitions for reinforcement that I've seen before include "Augmentation" , "Back-up" , "Strengthening" , "supporting structure" , "More support needed" .)