Like this ace, card is very wet (7)
I believe the answer is:
soaking
'very wet' is the definition.
(I know that soaking is a more specific form of the attribute very wet)
'like this ace card' is the wordplay.
'like this' becomes 'so' ('like so').
'ace' becomes 'a' (abbreviation).
'card' becomes 'king' (type of playing card).
'so'+'a'+'king'='SOAKING'
'is' acts as a link.
(Other definitions for soaking that I've seen before include "Wet" , "Drenched" .)