Crossword Genius

The pal in –palindrome”? (4)

Ross

I believe the answer is:

oppo

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If this is the answer I cannot explain how the clue works.

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(Other definitions for oppo that I've seen before include "Colleague, friend (colloq.)" , "Mate" , "Opposite number (colloq.)" , "China" , "Counterpart; rival" .)

I've seen this clue in the Evening Standard.
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