One channel that airs “NCAA March Madness,” with “TV” Crossword Clue

 The answer to the crossword clue "TV channel that airs NCAA March Madness" is TBS.

TBS is a basic cable television network that is owned by Warner Bros. Discovery. It is one of the four networks that broadcasts NCAA March Madness games, along with CBS, TNT, and truTV. TBS typically airs the first and second round games, as well as the Sweet 16 and Elite Eight games.

The answer fits the crossword clue because it is a television channel that airs NCAA March Madness games, and the word "TBS" starts with the letter "T".