Crossword Genius

A car nut could, in trouble, suck out essential fluid! (12)

Ross

I believe the answer is:

countdracula

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'suck out essential fluid' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'a car nut could in trouble' is the wordplay.
'in trouble' indicates an anagram.
'a'+'car'+'nut'+'could'='acarnutcould'
'acarnutcould' with letters rearranged gives 'COUNTDRACULA'.

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I've seen this clue in The Irish Times.
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