Crossword Genius

Oldest bus around, certainly ... (9)

Ross

I believe the answer is:

doubtless

'certainly' is the definition.
(thesaurus)

'oldest bus around' is the wordplay.
'around' indicates an anagram.
'oldest'+'bus'='oldestbus'
'oldestbus' with letters rearranged gives 'DOUBTLESS'.

(Other definitions for doubtless that I've seen before include "Assuredly" , "Unquestionably" , "of course" , "Probably, certainly" , "Positive" .)

I've seen this clue in The Independent.
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