2 down
Short
act
over
in
play
–
it’s
the
interval
(6)
Short act over in play – it’s the interval (6)
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The definition is at the end of the clue.
How the clue works
So interval is your definition — an octave being a span of eight notes. 'Act over' loses its final letter because of 'Short', leaving 'act ove', and then those six letters get scrambled ('in play') to give you the answer.