Take it if you mean to stay dry (6)

I believe the answer is:

pledge

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'dry' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for pledge that I've seen before include "Promise (to abstain?)" , "Firm commitment" , "Promise, oath" , "Give one's word" , "Solemn promise" .)

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

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