Deputy ruler of men out East (7)
I believe the answer is:
viceroy
'east' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'deputy ruler of men' is the wordplay.
'deputy' becomes 'vice' (as in vice-president).
'ruler of men' becomes 'roy' (I can't explain this - if you can you should give a lot more credence to this answer).
'vice'+'roy'='VICEROY'
'out' acts as a link.
Can you help me to learn more?
(Other definitions for viceroy that I've seen before include "sovereign's governor" , "Ruler of a colony" , "Monarch's plenipotentiary - American butterfly, like (but smaller than) a monarch" , "Governor ruling in name of sovereign" , "One ruling in a colony" .)