Tea with Doctor Charles is material? (8)

I believe the answer is:

chambray

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'material?' is the definition.
(chambray is a kind of material)

'tea with doctor charles' is the wordplay.
'tea' becomes 'cha' (cha is a type of tea).
'with' means one lot of letters go next to another.
'doctor' becomes 'MB' (Bachelor of Medicine, Medicinae Baccalaureus).
'charles' becomes 'ray' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'cha'+'mb'+'ray'='CHAMBRAY'

'is' is the link.

Can you help me to learn more?

(Another definition for chambray that I've seen is " Mary Bach makes a lightweight woven fabric".)

I've seen this clue in the Sydney Morning Herald.

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