Crossword Genius

Whole public service creates reservoirs (5)

Ross

I believe the answer is:

sumps

I'm a little stuck... Click here to teach me more about this clue!

'reservoirs' is the definition.
(I know this)

'whole public service' is the wordplay.
'whole' becomes 'sum' (sum is a kind of whole).
'public service' becomes 'ps' (this might be a standard abbreviation of which I'm unaware).
'sum'+'ps'='SUMPS'

'creates' acts as a link.

Can you help me to learn more?

(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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