Somehow pose as something valuable (4)

I believe the answer is:

peso

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'something valuable' is the definition.
I can't tell whether this definition defines the answer.

'somehow pose' is the wordplay.
'somehow' indicates anagramming the letters.
'pose' is an anagram of 'PESO'.

'as' is the link.

Can you help me to learn more?

(Other definitions for peso that I've seen before include "ready for Mexican" , "Mexican coin" , "Mexican monetary unit" , "Chilean currency" , "Mexican dollar" .)

I've seen this clue in The Mirror.

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