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Is afraid when Lester collapses and gets the doctor in (8)

Ross

I believe the answer is:

trembles

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

'in' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'is afraid when lester collapses and gets the doctor' is the wordplay.
I cannot really see how this works, but
'when' could be 'e' (I've seen this in other clues) and 'e' is present in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
'doctor' could be 'mb' (Bachelor of Medicine, Medicinae Baccalaureus) and 'mb' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for trembles that I've seen before include "Shivers involuntarily as from fear" , "Quivers" .)

I've seen this clue in the Evening Standard.
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