Set forth and must trap new wild cat (9)
I believe the answer is:
announced
'set forth' is the definition.
'and must trap new wild cat' is the wordplay.
'must trap' is an insertion indicator.
'new' becomes 'n'.
'wild cat' becomes 'ounce' (I've seen this before).
'n'+'ounce'='nounce'
'and' going around 'nounce' is 'ANNOUNCED'.
(Other definitions for announced that I've seen before include "reported" , "published" , "Proclaimed" , "Declared publicly" , "Revealed" .)