Crossword Genius

When the creature returns, gives it another dousing (6)

Ross

I believe the answer is:

spider

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

'dousing' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for spider that I've seen before include "Bathtub intruder - snooker rest" , "Eight-legged creatures" , "Predatory arachnid" , "Insect-eater" , "Member of arachnid family" .)

I've seen this clue in the Evening Standard.
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