Race or sprint around Northern Ireland! (6)
I believe the answer is:
danish
'race' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'sprint around northern ireland' is the wordplay.
'sprint' becomes 'dash' (synonyms).
'around' indicates putting letters inside.
'northern ireland' becomes 'NI' (abbreviation).
'dash' enclosing 'ni' is 'DANISH'.
'or' acts as a link.
Can you help me to learn more?
(Other definitions for danish that I've seen before include "_ blue; type of cheese" , "Popular piece of pastry" , "course includes article / noun combination" , "Flat cake - and party's his! (anag)" , "Nice pastry from Copenhagen" .)