Tacos ordered to form rib (5)
I believe the answer is:
costa
'rib' is the definition.
(I know that rib can be written as costa)
'tacos ordered' is the wordplay.
'ordered' indicates an anagram.
'tacos' is an anagram of 'COSTA'.
'to form' is the link.
(Other definitions for costa that I've seen before include "Rib (Botany, Zoology)" , "resort abroad" , "A Spanish coast like Del Sol" , "bone" , "Coast (anag.)" .)