He drinks to a steamship vessel (7)

I believe the answer is:

tosspot

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'he drinks' is the definition.
The definition suggests a singular noun which matches the answer.

'to a steamship vessel' is the wordplay.
'a steamship' becomes 'ss' (nautical abbreviation).
'vessel' becomes 'pot' (type of container).
'to'+'ss'+'pot'='TOSSPOT'

Can you help me to learn more?

(Other definitions for tosspot that I've seen before include "Fool" , "Drunk (informal)" , "Habitual drinker" , "One drunkard" , "One drinker" .)

I've seen this clue in The Globe and Mail and The Irish News.

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