Clever sheets of writing (6)

I believe the answer is:

theses

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'clever sheets of writing' is the definition.
I can't tell whether this definition defines the answer.

'clever sheets' is the wordplay.
'clever' indicates anagramming the letters.
'sheets' is an anagram of 'THESES'.

Can you help me to learn more?

(Other definitions for theses that I've seen before include "Degree dissertations" , "Premises" , "Academic dissertations" , "Essays on a theme" .)

I've seen this clue in the Evening Standard.

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