Crossword Genius

Horrid stay got worse after midday (5)

Ross

I believe the answer is:

nasty

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'horrid' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for nasty that I've seen before include "One who sees the future" , "Highly unpleasant" , "Spiteful and unkind" , "Foul" , "Obscene" .)

I've seen this clue in The Mirror.
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