In progress, no different to leaving (7)
I believe the answer is:
ongoing
'in progress' is the definition.
(synonyms)
'no different to leaving' is the wordplay.
'different' indicates anagramming the letters (letters placed in a different order).
'to leaving' becomes 'going' (synonyms).
'no' is an anagram of 'on'.
'on'+'going'='ONGOING'
(Other definitions for ongoing that I've seen before include "Current" , "Still in progress" , "Currently happening" , "still in operation" , "Currently in progress" .)