Vets test for disease on southern tip of Falklands (7)
I believe the answer is:
screens
'vets' is the definition.
(I've seen this before)
'test for disease on southern tip of falklands' is the wordplay.
I cannot quite see how this works, but
'on' could be 're' ('on' can be mean 'with reference to') and 're' is found within the answer.
'southern' could be 's' (abbreviation) and 's' is located in the answer.
The remaining letters 'cens' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for screens that I've seen before include "for security guards" , "Covers to conceal" , "Checks" , "Shows on the telly" , "vets" .)