Football bosses note Portuguese performance (4)
I believe the answer is:
fado
'portuguese performance' is the definition.
The definition suggests a singular noun which matches the answer.
'football bosses note' is the wordplay.
'football bosses' becomes 'fa' (I can't explain this - if you can you should believe this answer much more).
'note' becomes 'do' (musical note, as in do-re-mi).
'fa'+'do'='FADO'
Can you help me to learn more?
(Other definitions for fado that I've seen before include "Popular Portuguese song, often melancholy" , "Melancholy style of song popular in Portugal" , "Portuguese traditional dance and doleful song" , "Portuguese song genre" , "Portuguese song style" .)