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6 ac) Was revolver 9 inches in length?
The answer is 'span' - but I can't work out why.

If it' somehow relevant 9 ac) is:
Frank is 16 (4-6)
F_U_/S_ _ _ _ _ _
Any help joyfully received.

Thanks!

Bella

9a Four-Square

Span - was (a thing that revolved)

and

a measure

https://en.wikipedia.org/wiki/Span_(unit)#English_usage

Thanks Paul and mamya!