Sticky slug out in wild (9)
I believe the answer is:
glutinous
'sticky' is the definition.
(I know that sticky can be written as glutinous)
'slug out in wild' is the wordplay.
'wild' is an anagram indicator.
'slug'+'out'+'in'='slugoutin'
'slugoutin' is an anagram of 'GLUTINOUS'.
(Other definitions for glutinous that I've seen before include "Sticky" , "not easy to shake off?" .)