Crossword Genius

Like a hygienic pair of heels (5)

Ross

I believe the answer is:

clean

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

'pair of heels' is the definition.
The answer and definition can be both to do with contact as well as being verbs in their base form.
Maybe they are linked in a way I don't understand?

'like a hygienic' is the wordplay.
I cannot really see how this works, but
'a' could be 'an' and 'an' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for clean that I've seen before include "Sterile" , "Unsullied" , "Wash" , "Not obscene; smooth" , "Unsoiled" .)

I've seen this clue in the Evening Standard.
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