Shot silk is no means of keeping dry? (8)

I believe the answer is:
oilskins
'means of keeping dry?' is the definition.
Although both the answer and definition are plural nouns, I can't see how one could define the other.
'shot silk is no' is the wordplay.
'shot' is an anagram indicator.
'silk'+'is'+'no'='silkisno'
'silkisno' anagrammed gives 'OILSKINS'.
Can you help me to learn more?
(Another definition for oilskins that I've seen is " protective clothing".)
I've seen this clue in The Times.
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