Running as a cure for split in foot? (7)
I believe the answer is:
caesura
'split in foot?' is the definition.
(split in a metrical foot in poetry)
'running as a cure' is the wordplay.
'running' indicates anagramming the letters (the letters run around to different places).
'as'+'a'+'cure'='asacure'
'asacure' anagrammed gives 'CAESURA'.
'for' acts as a link.
(Other definitions for caesura that I've seen before include "Break in line" , "Short pause in a line of verse" , "Pause or interruption (in conversation or prose)" , "Pause near middle of verse line" .)