A single way of putting a plug in (7)

I believe the answer is:

sealing

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'putting a plug in' is the definition.
I can't judge whether this definition defines the answer.

'a single way' is the wordplay.
'way' indicates an anagram (another way of arranging the letters).
'a'+'single'='asingle'
'asingle' is an anagram of 'SEALING'.

'of' is the link.

Can you help me to learn more?

(Other definitions for sealing that I've seen before include "Securing" , "Making air/watertight" , "Making tight" , "Securely closing" , "Making leakproof?" .)

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

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