They remain one way to wreck a bus (5)

I believe the answer is:

stubs

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'they remain one' is the definition.
The definition suggests an adverb but the answer is not.

'way to wreck a bus' is the wordplay.
'way' becomes 'st' (abbreviation for street).
'to wreck' indicates an anagram.
'bus' is an anagram of 'ubs'.
'st'+'ubs'='STUBS'

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(Other definitions for stubs that I've seen before include "Butts" , "residual pieces" .)

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