Perhaps Springbok to run off after six footer (8)
I believe the answer is:
antelope
'perhaps springbok' is the definition.
(springbok is a type of antelope)
'run off after six footer' is the wordplay.
'run off' becomes 'elope' (synonyms).
'after' says to put letters next to each other.
'six footer' becomes 'ant' (an ant has six feet).
'elope' put after 'ant' is 'ANTELOPE'.
'to' acts as a link.
(Other definitions for antelope that I've seen before include "Graceful deer as a lone pet" , "A lone pet as a ruminant" , "Wild creature" , "Hoofed mammal" , "Eg, gazelle or gnu" .)