Her co-star upset big band (9)

I believe the answer is:

orchestra

'big band' is the definition.

'her co-star upset' is the wordplay.
'upset' is an anagram indicator.
'her'+'co'+'star'='hercostar'
'hercostar' anagrammed gives 'ORCHESTRA'.

(Other definitions for orchestra that I've seen before include "Musicians, maybe in theatre" , "Gamelan, for instance" , "Group of musical instrumentalists" , "those who provide the music" , "Musical ensemble" .)

I've seen this clue in The Telegraph and The Guardian.

Want a hint initially instead of a full solution? Install my app