TONGUETWISTER

It's hard to say (6-7)

Solution has appeared in 2 crosswords (1 across and 1 down):

• Quick crossword No 16,225 — 2022-05-08 23:00:13
  6D: 'Rubber baby buggy bumper', for example (6-7)
• Quick crossword No 15,905 — 2021-04-28 23:00:13
  21A: It's hard to say (6-7)