What does the cryptic crossword clue "Maybe Boycott is in, so can't bowl over (8)" mean?

The wordplay uses an anagram. anagram of IN, + SO + CAN'T = SANCTION The answer is SANCTION.

Maybe Boycott is in, so can't bowl over (8)

Guardian Cryptic #25923 | 6 Down | 2013-04-16 flower