Crossword Genius

Second request for watering device? (7)

Ross

I believe the answer is:

sprayer

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'watering device?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'second request' is the wordplay.
'second' becomes 's' (common abbreviation).
'request' becomes 'prayer' (prayer is a kind of request).
's'+'prayer'='SPRAYER'

'for' is the link.

Can you help me to learn more?

(Other definitions for sprayer that I've seen before include "Device to dispense liquid as a fine mist" , "Dispersing agent - aerosol" , "he'll paint your car" , "Atomiser" , "Sprinkler" .)

I've seen this clue in The Guardian.
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