Exercise section that makes a hole (8)

I believe the answer is:

drillbit

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

'a hole' is the definition.
Both the answer and definition are singular nouns.
Perhaps there's a link between them I don't understand?

'exercise section' is the wordplay.
'exercise' becomes 'drill' (synonyms).
'section' becomes 'bit' (both can mean part).
'drill'+'bit'='DRILLBIT'

'that makes' is the link.

Can you help me to learn more?

(Other definitions for drillbit that I've seen before include "Hole-cutting head" , "Borer" , "Cutting head" .)

I've seen this clue in The Daily Express.

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.