What does the cryptic crossword clue "In march, a revolutionary leader like Mao? (8)" mean?

The definition is "Mao?". The wordplay uses an anagram. anagram of IN + MARCH, + A = CHAIRMAN; definition: "leader like Mao?" The answer is Chairman.

In march, a revolutionary leader like Mao? (8)

Telegraph Prize Cryptic #3053 | 14 Down | 2020-04-26 flower