Wet Eskimo is tentatively hiding (7)
I believe the answer is:
moisten
'wet' is the definition.
(I know that moisten is a type of wet)
'eskimo is tentatively hiding' is the wordplay.
'hiding' indicates the answer is hidden within the clue.
'MOISTEN' is hidden in the letters of 'eskimo is tentatively'.
(Other definitions for moisten that I've seen before include "Make damp or slightly wet" , "water a bit" , "contrary to sixteen down [DEHYDRATE]!" , "It's on me (anag)" , "Add water - dampen" .)