Bump (7)

I think it could be either:

Which length description are you looking for?:

collide

'bump' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for collide that I've seen before include "Dash together; clash" , "Run into" , "Smash together" , "Crash together" , "Hit" .)

I've seen this clue in The Telegraph.

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