Diplomacy no cold warring competition (8)
I believe the answer is:
olympiad
'competition' is the definition.
(I know that Olympiad is a type of athletic competition)
'diplomacy no cold warring' is the wordplay.
'no' suggests deleting specific letters.
'cold' becomes 'c' (eg on taps).
'warring' indicates an anagram.
'diplomacy' with 'c' taken away is 'diplomay'.
'diplomay' anagrammed gives 'OLYMPIAD'.
(Other definitions for olympiad that I've seen before include "international competition" , "four-year period" , "International contest in bridge, chess" , "Four-yearly sporting event" , "employed for four years" .)