Party-giver is given a plant (5)
I believe the answer is:
hosta
'plant' is the definition.
The answer is an example.
'party-giver is given a' is the wordplay.
'party giver' becomes 'host' (I've seen this before).
'is given' means one lot of letters go next to another.
'host'+'a'='HOSTA'
(Other definitions for hosta that I've seen before include "found in a bed, perhaps" , "Ornamental foliage plant; as hot (anag.)" , "Lily" , "Garden plant prized for its foliage" , "Athos (anag) - perennial plant" .)