Crossword Genius

Lab gear prepared for school lesson (7)

Ross

I believe the answer is:

algebra

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'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" .)

I've seen this clue in The Sun.
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