Swamps, doctor, and snow-drifts (6)

I believe the answer is:

drowns

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'swamps' is the definition.
The definition and answer can be both to do with contact as well as being verbs in their -s form.
Maybe you can see a link between them that I don't see?

'doctor and snow-drifts' is the wordplay.
'doctor' becomes 'Dr' (abbreviation).
'and' says to put letters next to each other.
'drifts' is an anagram indicator.
'snow' anagrammed gives 'owns'.
'dr'+'owns'='DROWNS'

Can you help me to learn more?

(Other definitions for drowns that I've seen before include "Soaks" , "Goes under" , "Kills in water or overpowers sound" , "Suffocates in water" , "Dies by submersion in water" .)

I've seen this clue in the Evening Standard.

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