Crossword Genius

One of those on motorbike, scared, I gathered (7)

Ross

I believe the answer is:

sidecar

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'one of those on motorbike' is the definition.
I can't tell whether this defines the answer.

'scared i gathered' is the wordplay.
'gathered' indicates anagramming the letters (the letters are gathered into a new order).
'scared'+'i'='scaredi'
'scaredi' is an anagram of 'SIDECAR'.

Can you help me to learn more?

(Other definitions for sidecar that I've seen before include "Cocktail - which some motor-cyclists get attached to?" , "Vehicle" , "Where a passenger may go" , "Appendage to motor cycle" , "Alcoholic drink" .)

I've seen this clue in The Telegraph.
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