What does the cryptic crossword clue "First signs of route uncovering this deep track (3)" mean?

The definition is "track". The wordplay uses acrostic. first letters of "route uncovering this" = RUT; definition: "track" The answer is RUT.

First signs of route uncovering this deep track (3)

Daily Mail Cryptic #17021 | 22 Across | 2023-01-27 flower