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Abstainer, one calculating amount of Assam, do we hear? (11)

Ross

I believe the answer is:

teetotaller

I'm a little stuck... Click here to teach me more about this clue!

'abstainer' is the definition.
(teetotaller is a kind of abstainer)

'one calculating amount of assam do we hear?' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'a' and 'a' is located in the answer.
'amount' could be 't' (T is an example) and 't' is found within the answer.
'of' could be 'o' and 'o' is present in the answer.
'we hear?' could be 'e' (I've seen this in other clues) and 'e' is found within the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for teetotaller that I've seen before include "as observant Muslim, say" , "Non-drinker" , "Abstainer from alcohol" , "Abstainer from drink" , "One dry" .)

I've seen this clue in The Times.
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