We hear this guy runs his tongue over part of ear (5)

I believe the answer is:

helix

I'm a little stuck... Click here to teach me more about this clue!

'part of ear' is the definition.
(the rim of the ear)

I cannot understand how the rest of the clue works.

(Other definitions for helix that I've seen before include "Intertwining with another" , "snail" , "Spiral shape" , "Three-dimensional object shaped like a corkscrew" , "that goes round and round and up and down" .)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.