Oil reservoirs (5)
I believe the answer is:
sumps
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">oil reservoirs</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Another definition for sumps that I've seen is " Oil reservoirs in car engines".)
I've seen this clue in the Sydney Morning Herald.
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