One encouraging the other (11)

I believe the answer is:

aphrodisiac

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

This is all the clue.

Can you help me to learn more?

(Other definitions for aphrodisiac that I've seen before include "Stimulant of desire" , "the other driver" , "Philtre" , "Substance exciting sexual desire" , "Exciting drug" .)

I've seen this clue in The Sunday Times.

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