Saying "Get it and run off" (8)
I believe the answer is:
uttering
'saying' is the definition.
(I've seen this in another clue)
'get it and run off' is the wordplay.
'and' is a charade indicator (letters next to each other).
'off' indicates anagramming the letters.
'get'+'it'='getit'
'getit' put after 'run' is 'rungetit'.
'rungetit' with letters rearranged gives 'UTTERING'.
(Other definitions for uttering that I've seen before include "Articulating" , "Publishing" , "Tiger-nut (anag.)" , "Saying" .)