The Mouthpiece of an Instrument Like a Recorder

This page is the CodyCross answer for the clue below from Underground Worlds, Group 2162, Puzzle 1 (Rope Ladders).

Question is: The Mouthpiece of an Instrument Like a Recorder

and the answer is: FIPPLE

Word Meaning:

FIPPLE — (music) The mouthpiece of a ducted flute, or the plug forming the floor of the windway.

Definitions from Wiktionary.