Really great to embrace peace at last (4)
I believe the answer is:
huge
'really great' is the definition.
(huge means very big or great)
'embrace peace at last' is the wordplay.
'embrace' becomes 'hug' (hug is a kind of embrace).
'at last' indicates one should take the final letters.
The last letter of 'peace' is 'e'.
'hug'+'e'='HUGE'
'to' acts as a link.
(Other definitions for huge that I've seen before include "Extremely large" , "Vast; immense" , "Enormous" , "Great in size or amount" , "Gigantic" .)