Moderate figures in ancient Rome (4)

I believe the answer is:

mild

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'moderate' is the definition.
(similar in meaning)

I cannot understand how the remainder of the clue works.

(Other definitions for mild that I've seen before include "Moderate, temperate" , "Gentle and moderate" , "Beer darker than bitter - not bitter" , "Clement -- type of beer" , "Not intense; beer" .)

I've seen this clue in the Evening Standard.

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