Crossword Genius

What does foot have three times as many of as hand? (6)

Ross

I believe the answer is:

inches

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'what does foot have three times as many' is the definition.
The definition suggests a comparative adjective but the answer is not.

'as hand?' is the wordplay.
'as' becomes 'in' (I've seen this in other clues).
'hand?' becomes 'ches' (I can't justify this - if you can you should give a lot more credence to this answer).
'in'+'ches'='INCHES'

'of' is the link.

Can you help me to learn more?

(Other definitions for inches that I've seen before include "Twelves of these in a foot" , "Moves in small steps" , "Moves slowly and cautiously" , "Short lengths" , "Twelve of them in a foot" .)

I've seen this clue in The Times.
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