Wet fat (8)
I believe the answer is:
dripping
I believe this is a double definition.
'wet' is the first definition.
(similar in meaning)
'fat' is the second definition.
(I know that dripping is a type of animal fat)
(Other definitions for dripping that I've seen before include "tap needing washer?" , "Saturated" , "sweaty" , "Fat melted from roasted meat" , "F [FAT]" .)