Crossword Genius

Additional pair of letters for dictator? (6)

Ross

I believe the answer is:

excess

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

'additional' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

'pair of letters for dictator?' is the wordplay.
I cannot really understand how this works, but
'letters' could be 'es' (more than one E) and 'es' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for excess that I've seen before include "more than enough" , "What Orsino wanted of music" , "Immoderation as in eating, too much" , "A quantity larger than is needed or immoderation" , "Overabundance" .)

I've seen this clue in The Guardian.
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