Crossword Genius

Ring through often on such personal extensions? (8)

Ross

I believe the answer is:

earlobes

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

'extensions?' is the definition.
Although both the answer and definition are plural nouns, I cannot see how one could define the other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

I've seen this clue in The Times.
Want a hint initially instead of a full solution? Install my app