Give notice of conflict before mid-morning (4)
I believe the answer is:
warn
'give notice' is the definition.
(I've seen this in another clue)
'conflict before mid-morning' is the wordplay.
'conflict' becomes 'war' (war is a kind of conflict).
'before' says to put letters next to each other.
'mid' says to take the centre (mid- can mean the middle of something).
The middle of 'morning' is 'n'.
'war'+'n'='WARN'
'of' acts as a link.
(Other definitions for warn that I've seen before include "Sound the alarm" , "Admonish, caution" , "Give advance notice to" , "Give a caution to" , "Notify of potential risk" .)