Greek guy, for instance, admitted he likes to cop a feel (6)
I believe the answer is:
groper
'admitted he likes to cop a feel' is the definition.
The definition suggests a singular noun which matches the answer.
'greek guy for instance' is the wordplay.
'greek' becomes 'G' (philological abbreviation).
'guy' becomes 'rope' (guy is a type of rope or cable).
'for instance' becomes 'r' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'g'+'rope'+'r'='GROPER'
Can you help me to learn more?
(Other definitions for groper that I've seen before include "fish" , "One casting about" .)