Bracken, eg (4)
I believe the answer is:
fern
'bracken eg' is the definition.
(bracken is a kind of fern)
This is all the clue.
(Other definitions for fern that I've seen before include "Bracken, for example" , "Feathery-leaved plant" , "Flowerless plant with feathery green leaves, common on mountains" , "Often shady plant" , "Type of plant" .)