Saint needs cake for slow walk (6)
I believe the answer is:
stroll
'slow walk' is the definition.
(I've seen this in another clue)
'saint needs cake' is the wordplay.
'saint' becomes 'st' (abbreviation).
'needs' means one lot of letters go next to another.
'cake' becomes 'roll' (roll is a type of cake eg Swiss roll).
'st'+'roll'='STROLL'
'for' acts as a link.
(Other definitions for stroll that I've seen before include "Walk casually" , "A pleasant and leisurely walk" , "Amble along" , "Gentle walk" , "Walk in a leisurely way" .)