Staying power, running under cane (9)
I believe the answer is:
endurance
'staying power' is the definition.
(I've seen this before)
'running under cane' is the wordplay.
'running' indicates an anagram (the letters run around to different places).
'under'+'cane'='undercane'
'undercane' with letters rearranged gives 'ENDURANCE'.
(Other definitions for endurance that I've seen before include "Polar ship" , "Ability to withstand hardship for long periods" , "Patient suffering" , "Crude Anne (anag.)" , "Ill-fated vessel" .)