Slow walk south with giant (6)
I believe the answer is:
stroll
'slow walk' is the definition.
(I've seen this in another clue)
'south with giant' is the wordplay.
'south' becomes 'S' (abbreviation).
'with' means one lot of letters go next to another.
'giant' becomes 'troll' (I've seen this before).
's'+'troll'='STROLL'
(Other definitions for stroll that I've seen before include "Meander" , "Saunter in no particular direction" , "Walk in a leisurely way" , "Promenade" , "A casual or lazy walk" .)