What does the cryptic crossword clue "Promotion from flier – 1/3 off! (4)" mean?

The definition is "Promotion". The wordplay uses a deletion. PUFF (deletion) = PUFF The answer is PUFF.

Promotion from flier – 1/3 off! (4)

Guardian Cryptic #29430 | 25 Down | 2024-07-09 flower