Sign NCO produced in Swiss town (8)
I believe the answer is:
scorpion
'sign' is the definition.
(I've seen this before)
'produced in swiss town' is the wordplay.
'produced' becomes 'corp' (I am not sure about this - if you are sure you should believe this answer much more).
'in' is an insertion indicator.
'swiss town' becomes 'sion' (I've seen this in other clues).
'corp' going within 'sion' is 'SCORPION'.
'nco' is the link.
This may not be correct. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for scorpion that I've seen before include "Small lobster-shaped animal" , "As above (Latin)" , "Poisonous creature" , "Kind of spider with pincers and stinging tail" , "Poisonous arachnid" .)