Here's a little wrinkle for you (6)
I believe the answer is:
cockle
'wrinkle for you' is the definition.
'cockle' can be an answer for 'wrinkle' (cockling is a kind of wrinkling). I am unsure of the 'for you' bit.
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for cockle that I've seen before include "Young man" , "Shellfish" , "Mollusc - cornfield weed" , "Edible bivalve mollusc" , "Seafood item" .)