Crossword Genius

Hard work’s upset a delicate lass (5)

Ross

I believe the answer is:

sylph

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

This clue could be a double definition.

'hard work's upset' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'a delicate lass' is the second definition.
(sylph can mean a slender young woman)

Can you help me to learn more?

(Other definitions for sylph that I've seen before include "Slender, graceful girl" , "Slim woman" , "Imaginary (female) being" , "Slim person" , "Slender and graceful young woman" .)

I've seen this clue in The Times.
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