Saint went on horseback or went on foot? (6)
I believe the answer is:
strode
'went on foot?' is the definition.
(I've seen this before)
'saint went on horseback' is the wordplay.
'saint' becomes 'st' (abbreviation).
'went on horseback' becomes 'rode' (I've seen this before).
'st'+'rode'='STRODE'
'or' acts as a link.
(Other definitions for strode that I've seen before include "Walked fast with long steps" , "Paced" , "Galumphed" , "went on foot" .)