Continue to suppose parking unavailable? (6)

I believe the answer is:

resume

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'continue' is the definition.
(resuming is a kind of continuing)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for resume that I've seen before include "account, in brief" , "Begin again (after gap)" , "Re-open" , "Start again where one left off" , "Short descriptive summary" .)

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