Staff in broadcast said to welcome argument (12)
I believe the answer is:
disagreement
'argument' is the definition.
(a disagreement is an argument)
'staff in broadcast said to welcome' is the wordplay.
'staff' becomes 'men' (I've seen this in other clues).
'in' is an insertion indicator.
'broadcast said' becomes 'disa' (I can't explain this - if you can you should believe this answer much more).
'to welcome' becomes 'greet' (to greet someone is to welcome them).
'disa'+'greet'='disagreet'
'men' put inside 'disagreet' is 'DISAGREEMENT'.
Can you help me to learn more?
(Other definitions for disagreement that I've seen before include "Quarrel" , "Difference of opinion" , "Argument" , "Conflict" , "Contretemps" .)