Excellent try (5)
I believe the answer is:
crack
This clue is a double definition.
'excellent' is the first definition.
(the most excellent, as in a 'crack team')
'try' is the second definition.
(I know that crack is a type of try)
(Other definitions for crack that I've seen before include "Thin fissure or slangy joke" , "Opening; sharp blow" , "attempt" , "Break sharply; a joke" , "Narrow opening; joke" .)