Humid current around river (8)
I believe the answer is:
tropical
'humid' is the definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?
'current around river' is the wordplay.
I cannot really see how this works, but
'current' could be 'i' (physics symbol) and 'i' is found in the answer.
'around' could be 'ca' (circa) and 'ca' is present in the answer.
'river' could be 'r' (abbreviation) and 'r' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for tropical that I've seen before include "Hot and humid, as north and south of the equator" , "Belonging to hot regions" , "Hot and humid type of weather" , "Fervidly hot" , "April-Oct, unusually humid and very hot" .)