Crossword Genius

At the end of the day, must be unwholesome (5)

Ross

I believe the answer is:

musty

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

'unwholesome' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

'at the end of the day must' is the wordplay.
'at' means one lot of letters go next to another.
'the end of the' says to take the final letters.
The last letter of 'day' is 'y'.
'y' after 'must' is 'MUSTY'.

'be' is the link.

Can you help me to learn more?

(Other definitions for musty that I've seen before include "Mouldy; stale-smelling" , "Mouldy; outdated" , "Stale and stuffy" , "Frowsty" , "Smelling of mould" .)

I've seen this clue in the Evening Standard.
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