Picky (6)
'picky' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for choosy that I've seen before include "Picky or particular" , "Difficult to please" , "Selective" , "Fastidious (colloq.)" , "Discriminating" .)
(Other definitions for eater that I've seen before include "Apple, perhaps" , "Fruit (but not a cooker)" , "Consumer of food" , "Person taking course" , "type of fruit" .)
'picky' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for selective that I've seen before include "Choosy" , "Tending to choose carefully" , "Choosing carefully" .)