Crossword Genius

Work for the creature with a months leave (4)

Ross

I believe the answer is:

opus

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

'work' is the definition.
(an opus is an artistic work)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for opus that I've seen before include "Composer's work" , "Work of 25 perhaps" , "Musical piece" , "Composition - magnum __" , "A Latin work" .)

I've seen this clue in The Irish Independent.
Want a hint initially instead of a full solution? Install my app