Crossword Genius

Aggregate's put round opening of petrol reservoirs (5)

Ross

I believe the answer is:

sumps

'reservoirs' is the definition.
(sump is a kind of reservoir)

'aggregate's put round opening of petrol' is the wordplay.
'aggregate's' becomes 'sums' ('sum' can be a synonym of 'aggregate').
'put round' means one lot of letters goes inside another.
'opening of' suggests taking the first letters.
The first letter of 'petrol' is 'p'.
'sums' going around 'p' is 'SUMPS'.

(Another definition for sumps that I've seen is " Oil reservoirs in car engines".)

I've seen this clue in The Telegraph.
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