Beast doubly provided with an heir? (5)
I believe the answer is:
bison
'beast' is the definition.
(I've seen this before)
'doubly provided with an heir?' is the wordplay.
'doubly' becomes 'bi' (I can't explain this - if you can you should believe this answer much more).
'provided with' says to put letters next to each other.
'an heir?' becomes 'son' (I've seen this in another clue).
'bi'+'son'='BISON'
Can you help me to learn more?
(Other definitions for bison that I've seen before include "North American buffalo" , "brute" , "Big beast" , "European beast" , "Large humped bovid of N America" .)