Crossword Genius

... mass being sung at the correct pitch (6)

Ross

I believe the answer is:

monkey

'mass being sung at the correct pitch' is the definition.
I can't tell whether this defines the answer.

'mass being sung at the correct pitch' is the wordplay.
'mass' becomes 'm' (symbol used in Physics e.g. f=ma).
'being sung at the correct pitch' becomes 'on key' (on the right musical key).
'm'+'onkey'='MONKEY'

(Other definitions for monkey that I've seen before include "Primate with a long tail" , "Naughty child - 500 pounds" , "Small primate" , "Naughty child; primate" , "PS500 (sl.)" .)

I've seen this clue in The Guardian.
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