Desire to show Apple title learners missed? (8)
I believe the answer is:
appetite
'desire' is the definition.
(appetite is a kind of desire)
I don't understand how the remainder of the clue works.
(Other definitions for appetite that I've seen before include "Hunger; desire" , "enthusiasm" , "stomach" , "Keenness for food" , "Natural desire to satisfy a need" .)