International Baccalaureate expenses which are climbing (6)
I believe the answer is:
ibexes
'international baccalaureate expenses' is the definition.
Although both the answer and definition are plural nouns, I don't see how they can define each other.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for ibexes that I've seen before include "Large mountain goats" , "Mountain-dwellers" , "Wild mountain goats with beards" , "Large wild goats" , "Wild mountain goats with backward-curving horns" .)