Crossword Genius

Barrier on waterway under pressure provides protection from water (4,6)

Ross

I believe the answer is:

damp course

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'protection from water' is the definition.
(I've seen this before)

'barrier on waterway under pressure' is the wordplay.
'barrier' becomes 'dam' (dam is a kind of barrier).
'on' says to put letters next to each other.
'waterway under' becomes 'course' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'pressure' becomes 'p' (abbreviation).
'course' after 'p' is 'pcourse'.
'dam'+'pcourse'='DAMP-COURSE'

'provides' is the link.

Can you help me to learn more?

(Other definitions for damp course that I've seen before include "housing benefit?" , "waterproofing" , "Protection from water" , "It'll fortify against bad weather" , "protective component of building" .)

I've seen this clue in The Independent.
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