Exclamation of 'Oh!' about a tragic end (3)
I believe the answer is:
och
'exclamation' is the definition.
(I have seen 'Scots exclamation ' mean 'och' so perhaps 'exclamation' could also mean 'och')
'oh about a tragic end' is the wordplay.
'about' indicates putting letters inside.
'end' says to take the final letters.
The final letter of 'tragic' is 'c'.
'oh' placed around 'c' is 'OCH'.
'of' acts as a link.
(Other definitions for och that I've seen before include "Scots expression of impatience" , "Jock's expression" , "Scottish exclamation" , "Pshaw!" , "Scotsman may cry" .)