Crossword Genius

If you bulge here, that's fine (5)

Ross

I believe the answer is:

swell

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

This clue might be a double definition.

'if you bulge here' is the first definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'fine' is the second definition.
(I've seen this before)

'that's' is the link.

Can you help me to learn more?

(Other definitions for swell that I've seen before include "Expand abnormally" , "Gentle sea movement" , "Inflate - fine" , "wonderful" , "blowing top" .)

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