Summer mo.

Answer:

AUG

Hint:

This month often brings the Dog Days and is named after a Roman emperor.

Explanation:

Summer mo." is short for "summer month," asking for a three-letter abbreviation of a month during summer. In the Northern Hemisphere, summer includes June, July, and August, and "AUG" is the standard abbreviation for August. The clue relies on common crossword shorthand where "mo." stands for "month," and the answer fits the expected length.

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