Fantastic fruit, a good deal from Florida, say (5)
I believe the answer is:
lotus
'fantastic fruit' is the definition.
(mythical fruit)
'a good deal from florida say' is the wordplay.
'a good deal' becomes 'lot' ('lot' can be a synonym of 'good deal').
'from florida say' becomes 'us' (US can mean American).
'lot'+'us'='LOTUS'
(Other definitions for lotus that I've seen before include "----- Eaters, indolent hedonists" , "the indolent took for eating" , "Type of water-lily" , "It helps with memory loss" , "Fruit of forgetfulness - water lily - car marque" .)