Brilliant player in team runs so amazingly (7)
I believe the answer is:
maestro
'brilliant player' is the definition.
(someone who plays a musical instrument very well)
'team runs so amazingly' is the wordplay.
'runs' becomes 'r' (cricket abbreviation).
'amazingly' is an anagram indicator.
'team'+'r'+'so'='teamrso'
'teamrso' is an anagram of 'MAESTRO'.
'in' is the link.
(Other definitions for maestro that I've seen before include "Master of an art, or a great conductor of music" , "Accomplished musician" , "best in field" , "special performer" , "Genius possibly" .)