What does the cryptic crossword clue "See the numbers drop away, every last one (4)" mean?

The definition is "See". The wordplay uses acrostic. last letters of "the numbers drop away," = ESPY; definition: "See" The answer is Espy.

See the numbers drop away, every last one (4)

Telegraph Prize Cryptic #3088 | 24 Across | 2020-12-27 flower