Crossword Genius

Small amount subsequently securing run to the Antarctic (8)

Ross

I believe the answer is:

southern

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

'antarctic' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for southern that I've seen before include "-- Cross, constellation" , "Of Counties Cork and Kerry, say" , "Austral" , "Antarctica is in this hemisphere" , "Towards the Antarctic" .)

I've seen this clue in The Independent.
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.