Crossword Genius

Crankcase reservoir (4)

Ross

I believe the answer is:

sump

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

This is all the clue.

(Other definitions for sump that I've seen before include "Hole collecting water for pump" , "Crankcase reservoir" , "Lubrication reservoir" , "Pit receiving drainage" , "It receives the engine oil" .)

I've seen this clue in The Sunday Times and The Times.
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