Two points to remark upon, in writing (5)

I believe the answer is:

essay

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'in writing' is the definition.
'essay' can be an answer for 'writing' (thesaurus). I am not certain of the 'in' bit.

'two points to remark' is the wordplay.
'two points' becomes 'es' (two compass points).
'to remark' becomes 'say' (to remark something is to say it).
'es'+'say'='ESSAY'

'upon' acts as a link.

Can you help me to learn more?

(Other definitions for essay that I've seen before include "Old experiment" , "Attempt - written work" , "Trial, piece of writing" , "School compeosition" , "Composition, paper, article" .)

I've seen this clue in the Evening Standard.

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