Nothing in game five, call for mark added to score? (5,4)

'mark added to score?' is the definition.
(symbol on sheet music)

'nothing in game five call' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'in' indicates putting letters inside.
'game' indicates an anagram (solving anagrams is a game).
'five'+'call'='fivecall'
'fivecall' anagrammed gives 'vilaclef'.
'o' put into 'vilaclef' is 'VIOLA CLEF'.

'for' is the link.