Possible Clues:

• Accompaniment for Bilbo struggling with wild goat
• Musical accompaniment
• This must be included in a player's score
• Essential accompaniment moved Gobbi a lot
• Wobbly Wigan stop their centres having part to play always
• I got a blob, playing - or a bit of a score maybe
• Compulsory (music)
• Bob's weird, fantastic goal - it's a must for the player
• Occurrence noticed outside by Tarkington
• Piece of music unsuitable as voluntary?