Animal with twin offspring? (5)
I believe the answer is:
bison
'animal' is the definition.
(I've seen this before)
'twin offspring?' is the wordplay.
'twin' becomes 'bi' (I can't justify this - if you can you should give a lot more credence to this answer).
'offspring?' becomes 'son' (male offspring).
'bi'+'son'='BISON'
'with' acts as a link.
Can you help me to learn more?
(Other definitions for bison that I've seen before include "Large humped bovid of N America" , "Large shaggy wild ox" , "Kind of shaggy cattle" , "brute" , "Buffalo Bill's prey" .)