Great Dr.’s disturbed by racer (8)

I believe the answer is:

dragster

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'racer' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's an association between them I don't understand?

'great dr 's disturbed' is the wordplay.
'disturbed' indicates an anagram.
'great'+'dr'+'s'='greatdrs'
'greatdrs' is an anagram of 'DRAGSTER'.

'by' acts as a link.

Can you help me to learn more?

(Other definitions for dragster that I've seen before include "Racing car" , "Fast car" , "Vehicle" , "Car adapted for acceleration race" , "Bike" .)

I've seen this clue in The Hindu.

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