Total time with colleague (5)
I believe the answer is:
tally
'total' is the definition.
('tally' can be a synonym of 'total')
'time with colleague' is the wordplay.
'time' becomes 't'.
'with' says to put letters next to each other.
'colleague' becomes 'ally' (I've seen this before).
't'+'ally'='TALLY'
(Other definitions for tally that I've seen before include "Agree - count" , "Coincide" , "Record; agree" , "Running total" , "Mark" .)