Crossword Genius

Court problem — ball out, feud developing (6,5)


I believe the answer is:

double fault

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'court problem' is the definition.
The definition suggests a singular noun which matches the answer.

'ball out feud developing' is the wordplay.
'developing' indicates an anagram (letters developed into a new form).
'balloutfeud' is an anagram of 'DOUBLE-FAULT'.

Can you help me to learn more?

(Other definitions for double fault that I've seen before include "bad service again" , "evidence of poor service?" .)

I've seen this clue in The Times.
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