Crossword Genius

Ground rule hit string-puller? (7)

Ross

I believe the answer is:

luthier

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'string-puller?' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'ground rule hit' is the wordplay.
'ground' is an anagram indicator ('grind' the letters into a new form).
'rule'+'hit'='rulehit'
'rulehit' is an anagram of 'LUTHIER'.

Can you help me to learn more?

(Other definitions for luthier that I've seen before include "maker of musical instruments" , "Maker of stringed instruments" .)

I've seen this clue in the Sydney Morning Herald.
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