Crossword Genius

Baby's left a wet blanket (10)

Ross

I believe the answer is:

spoilsport

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'a wet blanket' is the definition.
('spoilsport' can be a synonym of 'wet blanket')

'baby's left' is the wordplay.
'baby's' becomes 'spoils' (I can't explain this - if you can you should give a lot more credence to this answer).
'left' becomes 'port' (left side of a ship - opposite of starboard).
'spoils'+'port'='SPOILSPORT'

Can you help me to learn more?

(Other definitions for spoilsport that I've seen before include "Party pooper" , "One who ruins others' enjoyment" , "Person marring others' pleasure" , "One who reduces others' pleasure" , "One marring others' pleasure" .)

I've seen this clue in The Telegraph.
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