One true falsely getting there? (2,5)
I believe the answer is:
en route
'getting there?' is the definition.
(I've seen this in another clue)
'one true falsely' is the wordplay.
'falsely' indicates an anagram.
'one'+'true'='onetrue'
'onetrue' with letters rearranged gives 'EN ROUTE'.
(Other definitions for en route that I've seen before include "As part of a journey" , "March" , "'On the way (2,5)'" , "Along the way" , "In transit (French)" .)