One hundred — as far as the eye can see, mostly southern — sausages (8)

'sausages' is the definition.
Both the definition and answer are plural nouns.
Perhaps you can see a link between them that I can't see?

'one hundred as far as the eye can see mostly southern' is the wordplay.
'one hundred' becomes 'c' (Roman numeral).
'as far as the eye can see' becomes 'horizon' (I've seen this in another clue).
'mostly' means to remove the last letter (most but not all of the word).
'southern' becomes 's' (abbreviation).
'horizon' with its last letter taken off is 'horizo'.
'c'+'horizo'+'s'='CHORIZOS'

Can you help me to learn more?