Napoleon for one a large penguin? (7)
I believe the answer is:
emperor
This could be a double definition.
'napoleon for one' is the first definition.
(I know that Napoleon is a emperor)
'a large penguin?' is the second definition.
'emperor' can be an answer for 'penguin?' (emperor penguin is a kind of penguin). I am unsure of the 'a large' bit.
Can you help me to learn more?
(Other definitions for emperor that I've seen before include "A moth; a penguin" , "Title of sovereignty" , "chap such as Charlemagne" , "He rules over several states" , "Eg, Caesar" .)