Crossword Genius

Doing one better than while taking ecstasy, it might make you swell up (3,5)

Ross

I believe the answer is:

bee sting

I'm a little stuck... Click here to teach me more about this clue!

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

I don't understand the remainder of the clue.

Can you help me to learn more?

(Another definition for bee sting that I've seen is " Pain risked by apiarist?".)

I've seen this clue in The Times.
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