US penny and gold for last mythological creature (7)
I believe the answer is:
centaur
'mythological creature' is the definition.
(I've seen this before)
'us penny and gold for last' is the wordplay.
'us penny' becomes 'cent' (I can't explain this - if you can you should give a lot more credence to this answer).
'and' says to put letters next to each other.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'last' says to take the final letters.
The final letter of 'for' is 'r'.
'cent'+'au'+'r'='CENTAUR'
Can you help me to learn more?
(Other definitions for centaur that I've seen before include "Mythical horseman!" , "Horsey person" , "Mythological creature" , "Mythical creature with the head of a man and the body of a horse" , "Mythological man-horse" .)