Working, leaving? Continuing (7)
I believe the answer is:
ongoing
'continuing' is the definition.
(I've seen this before)
'working leaving?' is the wordplay.
'working' becomes 'on' (e.g. a machine is working or on).
'leaving?' becomes 'going' (synonyms).
'on'+'going'='ONGOING'
(Other definitions for ongoing that I've seen before include "Current" , "Currently in progress" , "Continuing to exist or progress" , "Currently happening" , "Actually in progress" .)