Diving apparatus from southern country (5)
I believe the answer is:
scuba
'diving apparatus' is the definition.
(I've seen this in another clue)
'southern country' is the wordplay.
'southern' becomes 's' (abbreviation).
'country' becomes 'Cuba' (Cuba is an example).
's'+'cuba'='SCUBA'
'from' acts as a link.
(Other definitions for scuba that I've seen before include "breather" , "Apparatus for divers" , "Self-contained underwater breathing apparatus (acronym)" , "Diving equipment" , "Skin-diver's device" .)