Spark marketing ideas circulated internally (6)
I believe the answer is:
ignite
'spark' is the definition.
(I've seen this in another clue)
'marketing ideas circulated internally' is the wordplay.
'internally' says the answer is hidden in the clue.
'circulated' says the letters should be written backwards (I've seen 'circulating' mean this).
'etingi' is hidden in the letters of 'marketing ideas'.
'etingi' reversed gives 'IGNITE'.
(Other definitions for ignite that I've seen before include "Cause to start burning" , "Touch off; inflame" , "Detonate" , "Put a match to" , "Kindle Fire" .)