I am leaving, passing on (9)

I believe the answer is:

imparting

'passing on' is the definition.
('impart' can be a synonym of 'pass on')

'i am leaving' is the wordplay.
'i am' becomes 'I'm' (contraction).
'leaving' becomes 'parting' (parting is a kind of leaving).
'im'+'parting'='IMPARTING'

(Another definition for imparting that I've seen is " making a contribution".)

I've seen this clue in The Daily Express.

Want a hint initially instead of a full solution? Install my app