Loud noises first sign of raucous rowsParseword Answer

How to solve this Parseword clue

The clue resolves to roars through the numbered wordplay changes below. Each step keeps the original phrase visible so the solution can be checked line by line.

1. Step 1substitution

   rows becomes oars

2. Step 2selectionIndicator: first sign of

   first sign of raucous becomes r

3. Step 3charade

   r oars becomes roars