Finest ever to play for N. Ireland? (4)
I believe the answer is:
best
'finest' is the definition.
(similar in meaning)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for best that I've seen before include "former football star" , "Optimum" , "Overcome" , "Limit of one's ability" , "George -, footballer" .)