Crossword Genius

Pass learner with ride's redesigned accelerator (8)

Ross

I believe the answer is:

collider

'accelerator' is the definition.
(a particle accelerator)

'pass learner with ride's redesigned' is the wordplay.
'pass' becomes 'col' (col is a term for a mountain pass).
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'with' means one lot of letters go next to another.
'redesigned' is an anagram indicator.
'ride' anagrammed gives 'ider'.
'col'+'l'+'ider'='COLLIDER'

(Another definition for collider that I've seen is " experimental technology".)

I've seen this clue in The Guardian.
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