Alright for a Greek character to have animal (5)
I believe the answer is:
Here is my best explanation:
'animal' is the definition.
(I've seen this before)
'alright for a greek character' is the subsidiary indication.
'alright' becomes 'ok' ('OK' can be a synonym of 'alright').
'for' means one lot of letters go next to another.
'greek character' becomes 'pi'.
'to have' is the link.
(Other definitions for okapi that I've seen before include "Giraffe-like animal with stripes", "Ruminant mammal of Africa", "Wild animal", "Ruminant related to the giraffe", "Giraffe-related mammal", "Mammal related to the giraffe", "Animal, a sort of zebra/giraffe cross", "Giraffe family member", "One of the giraffe family" and "Relative of giraffe".)