Solution: Transposition
Answer: CHOKE KNOBS

Written by Adam Gleitman

Five entries in the grid have two of their letters transposed:

Location Gridded Answer “Actual” Answer
17-Across MARHC KING MARCH KING
23-Across BRKOEN DOWN BROKEN DOWN
33-Across THE WEKEND THE WEEKND
48-Across PHOONGRAPH PHONOGRAPH
53-Across SUSBCRIBE SUBSCRIBE

“Un-transposing” these letters into their correct positions yields the phrase CHOKE KNOBS.

1R2A3S4P5P6G7A8Y9M10C11A
12ISTO13OUR14AARON
15CHRI16S17MAR18HCKING
19AISH20A21POOL22SAL
23BRKOEN24DOWN25ACIE
26OPENAIR27SE28EMARS
29TSR30TSA31R32NINE
33THEWE34K35END
36T37ONE38VIVE39C40P41A
42POSTD43O44C45REA46CHES
47ROMS48PH49OONGRAPH
50ECO51DEAR52TOOLS
53SUS54BCRIB55E56NOLI57E
58ETIKA59RIM60NACL
61TESS62STU63SHOO