Makes rapidly, with "out"

CRANKS

Think of what a mechanic might do quickly to an engine part.

The clue plays on the phrase "cranks out," which means to produce something quickly or in large quantities. Here, "out" is pulled to the end of the clue to hint at the phrasing, leaving "makes rapidly" to define "cranks." The answer is a verb that fits both the definition and the wordplay when combined with "out."