Animal in ancient times seen aboard ark? (6)
I believe the answer is:
bobcat
'animal' is the definition.
(I've seen this before)
'ancient times seen aboard ark?' is the wordplay.
'ancient times' becomes 'bc' (Before Christ).
'seen aboard' is an insertion indicator.
'ark?' becomes 'boat' (ark is a kind of boat).
'bc' put into 'boat' is 'BOBCAT'.
'in' is the link.
(Other definitions for bobcat that I've seen before include "Small lynx of Norht America" , "A sort of lynx" , "American native" , "Relation of the lynx" , "Type of lynx" .)