Crossword Genius

Dislikes balconies when end of rung is lowered (9)

Ross

I believe the answer is:

allergies

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

'dislikes' is the definition.
Although both the answer and definition are plural nouns, I don't see how one could define the other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for allergies that I've seen is " Unhealthy reactions".)

I've seen this clue in The Guardian.
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