Some characters in Ottawa keeping up (5)
I believe the answer is:
awake
'up' is the definition.
(similar in meaning)
'some characters in ottawa keeping' is the wordplay.
'some characters in' indicates the answer is hidden within the clue.
'AWAKE' can be found hidden inside 'ottawa keeping'.
(Other definitions for awake that I've seen before include "On the ball?" , "Cease sleeping" , "Unable to sleep" , "Stop sleeping" , "Conscious and (usually) open-eyed" .)