In a superior position to mash some potatoes (4)

I believe the answer is:

atop

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'in a superior position to mash some potatoes' is the definition.
I can't judge whether this defines the answer.

'in a superior position to' is the wordplay.
'in' is an insertion indicator.
'a superior position' becomes 'ap' (I can't justify this - if you can you should give a lot more credence to this answer).
'ap' enclosing 'to' is 'ATOP'.

Can you help me to learn more?

(Other definitions for atop that I've seen before include "highest level" , "Upon" , "highly placed" , "On the peak" , "on the head" .)

I've seen this clue in the Evening Standard.

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