Crossword Genius

Crack a word code for oil source (9)

Ross

I believe the answer is:

cedarwood

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'oil source' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'crack a word code' is the wordplay.
'crack' is an anagram indicator.
'a'+'word'+'code'='awordcode'
'awordcode' with letters rearranged gives 'CEDARWOOD'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for cedarwood that I've seen before include "'Sandalwood, ____ and 4 down 18 19' (Masefield)" , "it comes out of a tree" , "Hard, sweet-smelling timber" , "furniture maker" .)

I've seen this clue in The Times.
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