Case of speech defect, say (7)

I believe the answer is:

stutter

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'case of speech' is the definition.
'stutter' can be an answer for 'speech' (stutter is a kind of speech). I'm not sure about the 'case of' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for stutter that I've seen before include "Falter" , "Hesitation in speech over first consonants" , "Stumble over words" , "Stammer" , "Struggle to speak" .)

I've seen this clue in The Times and The Sunday Times.

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