Danger sign journo oddly felt, joining paper (3,4)
I believe the answer is:
red flag
'danger sign' is the definition.
(I've seen this in another clue)
'journo oddly felt joining paper' is the wordplay.
I cannot quite see how this works, but
'journo' could be 'ed' (I've seen this in other clues) and 'ed' is found in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for red flag that I've seen before include "Sign of danger - sign of socialism" , "Socialist banner?" , "A number of revolutionaries" , "A flyer" , "Instruction to halt" .)