Contradictions in terms used by foxy moralist (7)

I believe the answer is:

oxymora

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'contradictions in terms' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'used by foxy moralist' is the wordplay.
'used by' says the answer is hidden in the clue.
'OXYMORA' is hidden within 'foxy moralist'.

Can you help me to learn more?

(Another definition for oxymora that I've seen is " contradictory parts of speech".)

I've seen this clue in The Independent.

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