Lab gear prepared for school lesson (7)
I believe the answer is:
algebra
'school lesson' is the definition.
The answer and definition can be both related to thinking as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'lab gear prepared' is the wordplay.
'prepared' indicates an anagram.
'lab'+'gear'='labgear'
'labgear' is an anagram of 'ALGEBRA'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for algebra that I've seen before include "Calculation by symbols" , "Branch of generalised arithmetic" , "school subject" , "Branch of mathematics using letters and symbols" , "subject with many unknowns" .)