A deal with America for plant (5)
I believe the answer is:
lotus
'plant' is the definition.
'a deal with america' is the wordplay.
'a deal' becomes 'lot' (synonyms).
'with' is a charade indicator (letters next to each other).
'america' becomes 'US' (United States).
'lot'+'us'='LOTUS'
'for' acts as a link.
(Other definitions for lotus that I've seen before include "Large water lily" , "Plant widely regarded as sacred" , "Tropical water-lily" , "Water lily - fruit inducing forgetfulness" , "Kind of cross-legged position for meditation" .)