Weird euro-mist brings humidity (8)
I believe the answer is:
moisture
'humidity' is the definition.
(I've seen this in another clue)
'weird euro-mist' is the wordplay.
'weird' indicates anagramming the letters.
'euro'+'mist'='euromist'
'euromist' is an anagram of 'MOISTURE'.
'brings' is the link.
(Other definitions for moisture that I've seen before include "Wetness caused by water" , "Damp" , "Small amount of liquid causing dampness" , "Liquid, in drops perhaps" , "Liquid in small quantity, in the air say" .)