What does the cryptic crossword clue "Smooth ridges going west (5)" mean?

The definition is "Smooth". The wordplay uses a reversal. KEELS (reversal="‘ridges’") = SLEEK; definition: "Smooth" The answer is SLEEK.

Smooth ridges going west (5)

Guardian Cryptic #28966 | 11 Across | 2023-01-13 flower