A search of225 for "sounds like" found this clue from Feb 16 Guardian:
LECTOR Reader in church sounds like Hannibal? (6)
Homophone of Hannibal Lecter
In that case the "O or E" was a checked letter, so the crossers would have resolved it, but the suggestion here is that in "X sounds like Y", X is the definition. That was my initial thought when solving/