Slice could paradoxically be square (5)

I believe the answer is:

round

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

'slice' is the definition.
(I have seen 'Slice of bread ' mean 'round' so perhaps 'slice' could also mean 'round')

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for round that I've seen before include "Approximate" , "delivery trip?" , "Get applause" , "with 6D [SPARE TYRE]" , "Regular route for a sentry" .)

I've seen this clue in The Irish News.

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.