Criticise set of lectures in conversation (9)

I believe the answer is:

discourse

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'lectures in conversation' is the definition.
'discourse' can be an answer for 'conversation' (I've seen this before). I'm not sure about the 'lectures in' bit.

'criticise set' is the wordplay.
'criticise' becomes 'dis' (speak disrespectfully).
'set' becomes 'course' (I have seen 'Set of lessons ' mean 'course' so perhaps 'set' could also mean 'course').
'dis'+'course'='DISCOURSE'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for discourse that I've seen before include "Written or spoken communication" , "(Formal) talk" , "To hold a conversation" , "Speech - conversation" , "Communication verbally" .)

I've seen this clue in The Guardian.

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