Ended the burial at sea with boring patriotic display? (3,5,3,4)
I believe the answer is:
red white and blue
'patriotic display?' is the definition.
(I've seen this in another clue)
'ended the burial at sea with boring' is the wordplay.
'at sea' indicates an anagram.
'with' becomes 'w' (abbreviation).
'boring' is an insertion indicator (to bore something can mean to drill into it).
'ended'+'the'+'burial'='endedtheburial'
'endedtheburial' anagrammed gives 'redhiteandblue'.
'redhiteandblue' placed around 'w' is 'RED WHITE AND BLUE'.
(Another definition for red white and blue that I've seen is " display of patriotism".)