What does the cryptic crossword clue "Hurry, if you want to use the weighing machine (4,2,2)" mean?

The definition is "Hurry,". The wordplay uses a double definition. Double definition The answer is STEPONIT.

Hurry, if you want to use the weighing machine (4,2,2)

Guardian Cryptic #27311 | 1 Across | 2017-09-25 flower