Crossword Genius

Boundaries hit at last but not one ton (8)

Ross

I believe the answer is:

abuttals

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

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for abuttals that I've seen is " Boundaries".)

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