Ran back with speed to tell a tale (7)
I believe the answer is:
narrate
'tell a tale' is the definition.
'ran back with speed' is the wordplay.
'back' is a reversal indicator.
'with' says to put letters next to each other.
'speed' becomes 'rate' (rate is a kind of speed).
'ran' reversed gives 'nar'.
'nar'+'rate'='NARRATE'
'to' acts as a link.
(Other definitions for narrate that I've seen before include "tell tales" , "recount events" , "Give (film) commentary" , "Relate - portray" , "Rare ant (anag.)" .)