Source of oil is too scented unfortunately (10)

I believe the answer is:

cottonseed

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

'too scented unfortunately' is the wordplay.
'unfortunately' is an anagram indicator (a bad or unfortunate spelling).
'too'+'scented'='tooscented'
'tooscented' with letters rearranged gives 'COTTONSEED'.

'is' acts as a link.

Can you help me to learn more?

I've seen this clue in The Times.

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