Tricky-to-pronounce phrase (6,7)

I believe the answer is:

tongue twister

(Other definitions for tongue twister that I've seen before include "Difficult-to-say phrase" , "eg 'She sells seashells by the seashore'" , "What's difficult to say" , "Difficult saying?" , "Phrase difficult to articulate" .)

I've seen this clue in the Newsday.

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