What does the cryptic crossword clue "Go on foot in a westerly direction (3)" mean?

The definition is "Go on". The wordplay uses a reversal. PAY (reversal="foot e.g. the bill") = YAP; definition: "Go on" The answer is YAP.

Go on foot in a westerly direction (3)

Times Cryptic #28832 | 11 Across | 2024-02-06 flower