What does the cryptic crossword clue "Offend a tar working at both ends of boat (4,3,3)" mean?

The wordplay uses an anagram. anagram of OFFEND + A + TAR = FOREANDAFT The answer is FOREANDAFT.

Offend a tar working at both ends of boat (4,3,3)

Daily Mail Cryptic #16802 | 25 Across | 2022-03-28 flower