Adjust Instruments So They Play Perfect Notes

This page is the CodyCross answer for the clue below from TV Station, Group 608, Puzzle 2 (Peaky Blinders).

Question is: Adjust Instruments So They Play Perfect Notes

and the answer is: TUNEUP

Word Meaning:

TUNE UP — (transitive) To make adjustments (to an engine or bicycle drivetrain) in order to improve its performance.

Definitions from Wiktionary.