Indian fig tree (6)
'indian fig tree' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for banyan that I've seen before include "Fig tree with aerial roots" , "Indian fig tree with self-rooting branches" , "Multi-trunked Indian tree" , "Fig-tree found in th bay, Nan." , "plant" .)
(Another definition for peepul that I've seen is " tree".)