Crossword Genius

When we say goodbye, not stopping (7)

Ross

I believe the answer is:

ongoing

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'when we' is the definition.
I can't tell whether this definition defines the answer.

'goodbye not stopping' is the wordplay.
'goodbye' becomes 'on' (I can't justify this - if you can you should believe this answer much more).
'not stopping' becomes 'going' ('go' is the opposite to 'stop').
'on'+'going'='ONGOING'

'say' is the link.

Can you help me to learn more?

(Other definitions for ongoing that I've seen before include "Not yet concluded" , "Still in progress" , "still in operation" , "Continuing to exist or progress" , "Currently happening" .)

I've seen this clue in The Telegraph.
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