Espresso order (5)
I believe the answer is:
latte
'espresso order' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for latte that I've seen before include "Espresso with frothy milk" , "White coffee" , "Coffee with a topping of frothed steamed milk" , "Frothy milky coffee" , "See 21" .)