Crossword Genius

On foot and in conformity (6)

Ross

I believe the answer is:

instep

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'on foot' is the definition.
'instep' can be an answer for 'foot' (thesaurus). I'm not certain of the 'on' bit.

'in conformity' is the wordplay.
'conformity' becomes 'step' (I can't explain this - if you can you should believe this answer much more).
'in'+'step'='INSTEP'

'and' is the link.

Can you help me to learn more?

(Other definitions for instep that I've seen before include "Arched part of foot" , "Top of foot" , "One part of Oxford" , "Part of foot (how to march!)" , "Foot arch - conforming" .)

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