Unusual glee about a good golf score (5)
I believe the answer is:
eagle
'good golf score' is the definition.
(I've seen this in another clue)
'unusual glee about a' is the wordplay.
'unusual' indicates an anagram.
'about' means one lot of letters goes inside another.
'glee' with letters rearranged gives 'egle'.
'egle' going around 'a' is 'EAGLE'.
(Other definitions for eagle that I've seen before include "experts are putting more than albatross?" , "A glee-ful bird?" , "Keen-eyed bird" , "ten-dollar coin" , "flier" .)