Maybe a bit of a humdinger, albeit a bit wet (5)

I believe the answer is:

humid

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'wet' is the definition.
('humid' can be similar in meaning to 'wet')

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for humid that I've seen before include "Clammy" , "Describes air that contains a great deal of water vapour" , "Dank" , "(Of atmosphere) with high water vapour content" , "'Moist, damp (5)'" .)

I've seen this clue in the Evening Standard.

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