Crossword Genius

A little of the mighty (4)

Ross

I believe the answer is:

emir

I'm a little stuck... Click here to teach me more about this clue!

'a little' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for emir that I've seen before include "Arabian ruler" , "Eastern chieftain" , "Arab prince" , "Ruler or chieftain in Arabia" , "Muslim ruler stuck in mire" .)

I've seen this clue in the Evening Standard.
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