Where spirits may be found, ghost troubled girl (4,5)

I believe the answer is:

shot glass

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'where spirits may be' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'ghost troubled girl' is the wordplay.
'troubled' indicates an anagram.
'girl' becomes 'lass' (lass can informally mean a girl).
'ghost' with letters rearranged gives 'shotg'.
'shotg'+'lass'='SHOT GLASS'

'found' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.

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