Part of foot used for spinet (6)

I believe the answer is:

instep

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'part of foot' is the definition.
(I've seen this before)

'for spinet' is the wordplay.
'spinet' anagrams to 'INSTEP'.
However, I am unsure how the anagram is indicated.

'used' is the link.

Can you help me to learn more?

(Other definitions for instep that I've seen before include "Arch we stand on" , "Arch area of the foot" , "Part of foot/shoe" , "Part of foot between toes and ankle" , "downtrodden area" .)

I've seen this clue in The Irish News.

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