Crossword Genius

In moving, lose footrest (6)

Ross

I believe the answer is:

insole

I'm a little stuck... Click here to teach me more about this clue!

'footrest' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I don't see?

'in moving lose' is the wordplay.
'moving' indicates an anagram.
'lose' is an anagram of 'sole'.
'in'+'sole'='INSOLE'

Can you help me to learn more?

(Other definitions for insole that I've seen before include "Padding in a shoe" , "Inner part of shoe" , "Oxford's content" , "found in boot" , "Part of Oxford perhaps" .)

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