Concerning flow that is occurring regularly (9)

I believe the answer is:

recurrent

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'is occurring regularly' is the definition.
I can't judge whether this defines the answer.

'concerning flow' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'flow' becomes 'current' (current is a kind of flow).
're'+'current'='RECURRENT'

'that' acts as a link.

Can you help me to learn more?

(Other definitions for recurrent that I've seen before include "Coming round repeatedly" , "taking place periodically" , "Periodic" , "Occurring repeatedly" , "seen frequently" .)

I've seen this clue in the Sydney Morning Herald.

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