What does the cryptic crossword clue "Smear tactics from one leaving Orcadian, maybe (7)" mean?

The definition is "Smear". The wordplay uses a deletion. SLANDER (deletion) = SLANDER; definition: "Smear" The answer is SLANDER.

Smear tactics from one leaving Orcadian, maybe (7)

Guardian Cryptic #29534 | 20 Down | 2024-11-07 flower