Crossword Genius

Governmental title of two chaps out East (7)

Ross

I believe the answer is:

viceroy

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'east' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

I don't understand the remainder of the clue.

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(Other definitions for viceroy that I've seen before include "Monarch's plenipotentiary - American butterfly, like (but smaller than) a monarch" , "sovereign's governor" , "Governor ruling in name of sovereign" , "Sovereign's representative in a colony" , "One ruling in a colony" .)

I've seen this clue in the Evening Standard.
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