Humid without right current (7)

I believe the answer is:

topical

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'current' is the definition.
('topical' can be similar in meaning to 'current')

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for topical that I've seen before include "Contemporary" , "Having reference to current events" , "Of local interest" , "hot" , "Like The Sunday Times" .)

I've seen this clue in The Mirror.

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