Crossword Genius

Oil reservoir (4)

Ross

I believe the answer is:

sump

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

This is all the clue.

(Other definitions for sump that I've seen before include "Water collector" , "It receives the engine oil" , "Pit receiving drainage" , "Engine oil reservoir" , "oil well?" .)

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