Incitement to riot, say, in second issue (8)
I believe the answer is:
sedition
'incitement to riot' is the definition.
(I've seen this before)
'in second issue' is the wordplay.
'in second' becomes 's' (common abbreviation. I am not sure about the 'in' bit.).
'issue' becomes 'edition' (edition is a kind of issue).
's'+'edition'='SEDITION'
'say' acts as a link.
Can you help me to learn more?
(Other definitions for sedition that I've seen before include "Rabble-rousing" , "Mutiny" , "agitation" , "Stirring up of rebellion or disorder" , "Criminal behaviour" .)