Water lily collection going to America (5)
I believe the answer is:
lotus
'water lily' is the definition.
(lotus is a kind of water lily)
'collection going to america' is the wordplay.
'collection' becomes 'lot' (lot is a kind of collection**).
'going to' is a charade indicator (letters next to each other).
'america' becomes 'us' (abbreviation for the United States).
'lot'+'us'='LOTUS'
(Other definitions for lotus that I've seen before include "Mythical fruit inducing dreamy state" , "the indolent took for eating" , "Kind of cross-legged position for meditation" , "Plant that mythically induces languor" , "In myth, a plant whose fruit induced forgetfulness" .)