Compound is earned, somehow (8)

I believe the answer is:

arsenide

'compound' is the definition.
(I've seen this before)

'is earned somehow' is the wordplay.
'somehow' is an anagram indicator.
'is'+'earned'='isearned'
'isearned' is an anagram of 'ARSENIDE'.

(Another definition for arsenide that I've seen is " Compound of poisonous element; nearside (anag.)".)

I've seen this clue in The Daily Express.

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