In the highest position among tomato purees (4)

I believe the answer is:

atop

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'in the highest position' is the definition.
I can't judge whether this defines the answer.

'among tomato purees' is the wordplay.
'among' indicates the answer is hidden within the clue.
'ATOP' is hidden in the letters of 'tomato purees'.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.

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