Not flush with plastic tines (5)
I believe the answer is:
inset
'not flush' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'plastic tines' is the wordplay.
'plastic' indicates an anagram (plastic can mean easily moulded).
'tines' with letters rearranged gives 'INSET'.
'with' is the link.
Can you help me to learn more?
(Other definitions for inset that I've seen before include "It could be stuck between pages" , "Something inserted" , "Implant" , "Small diagram contained by larger one" , "one image within another" .)