Crossword Genius

Oil reservoir (4)

Ross

I believe the answer is:

sump

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">oil reservoir</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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 Sunday Times, The Times and The Guardian.
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