They breathe through blowholes (6)

I believe the answer is:

whales

'they breathe through blowholes' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for whales that I've seen before include "Huge sea mammals" , "Large cetacean mammals" , "Beasts" , "Marine mammals" , "Great ocean mammals" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.

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.