Free rent? Ground for a plant with fronds! (4,4)
I believe the answer is:
tree fern
'a plant with fronds' is the definition.
I can't judge whether this defines the answer.
'free rent? ground' is the wordplay.
'ground' is an anagram indicator ('grind' the letters into a new form).
'free'+'rent'='freerent'
'freerent' is an anagram of 'TREE-FERN'.
'for' is the link.
Can you help me to learn more?
(Other definitions for tree fern that I've seen before include "Palm-like plant" , "Tall plant" , "tropical plant" .)