Ran up share account (9)
I believe the answer is:
narration
'account' is the definition.
(narration is a kind of account)
'ran up share' is the wordplay.
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'share' becomes 'ration' (ration is a kind of share).
'ran' backwards is 'nar'.
'nar'+'ration'='NARRATION'
(Other definitions for narration that I've seen before include "Spoken account" , "Account of events" , "Voice-over in film" , "Process of storytelling" , "Story" .)