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Something disappointing — relegation? That has sour taste? (5,4)

Ross

I believe the answer is:

lemon drop

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'sour taste?' is the definition.
The definition suggests a singular noun which matches the answer.

'something disappointing relegation? that has' is the wordplay.
'something disappointing' becomes 'lemon' (lemon can mean a faulty or unsatisfactory thing).
'relegation?' becomes 'drop' (relegation can mean dropping down).
'that has' means one lot of letters go next to another.
'lemon'+'drop'='LEMON-DROP'

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(Another definition for lemon drop that I've seen is " Fruit sweet".)

I've seen this clue in The Times.
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