Six-footer among banyan trees (3)
I believe the answer is:
Here is my best explanation:
'six-footer' is the definition.
'among banyan trees' is the subsidiary indication.
'among' indicates the answer is hidden within the clue.
'ant' is hidden within 'banyan trees'.
(Other definitions for ant that I've seen before include "The insect lives in a social colony", "that may be a soldier", "Worker on the hill", "Soldier", "A soldier, for one", "Member of colony", "Proverbially hard-working insect", "One working hard", "Hard-working insect" and "` `Go to the ... thou sluggard' '".)