Crossword Genius

Auxiliary motor in a rocket (7)

Ross

I believe the answer is:

booster

(Other definitions for booster that I've seen before include "Additional dose to make sure the first one was effective" , "Additional strengthening dose" , "Additional dose that makes sure the first was effective" , "Supplementary vaccine dose" , "tonic" .)

I've seen this clue in The Telegraph.
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