Ordering option (1,2,5)
I believe the answer is:
a la carte
'ordering option' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for a la carte that I've seen before include "way of ordering things" , "Not part of a restaurant's set meal" , "Where dishes are ordered separately, not from a set menu" , "A real cat (anag.)" , "Menu with individual dishes priced separately" .)