Crossword Genius

Lacking goals, it's the essence of improvised music (2-5)

Ross

I believe the answer is:

no-score

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'lacking goals' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'it's the essence of improvised music' is the wordplay.
'it' becomes 'pronoun' ('it' is a pronoun).
'the essence' indicates the central letters (essence can mean the core of something).
'of' becomes 'o''.
'improvised music' becomes 'score' (score is a kind of music. I am not sure about the 'improvised' bit.).
The central letter of 'pronoun' is 'n'.
'n'+'o'+'score'='NO SCORE'

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I've seen this clue in The Irish Times.
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