Item for sale, American plant (5)
I believe the answer is:
lotus
'plant' is the definition.
(lotus is a kind of plant)
'item for sale american' is the wordplay.
'item for sale' becomes 'lot' (I've seen this before).
'american' becomes 'us'.
'lot'+'us'='LOTUS'
(Other definitions for lotus that I've seen before include "TREE" , "Kind of cross-legged position for meditation" , "Sacred waterlily" , "Sacred flower" , "Reason for forgetfulness" .)