Dish as ordered by boy (5)
I believe the answer is:
salad
'dish' is the definition.
(type of meal or dish)
'as ordered by boy' is the wordplay.
'ordered' indicates anagramming the letters.
'by' says to put letters next to each other.
'boy' becomes 'lad' (informal term for boy).
'as' with letters rearranged gives 'sa'.
'sa'+'lad'='SALAD'
(Other definitions for salad that I've seen before include "one gets dressed" , "Raw vegetables, etc" , "Lettuce, cucumber etc" , "Food dish" , "Raw greens, mainly" .)