Crossword Genius

Spiritual number brings in a grand, perhaps (5)

Ross

I believe the answer is:

piano

'grand perhaps' is the definition.
(grand is a kind of piano)

'spiritual number brings in a' is the wordplay.
'spiritual' becomes 'pi' (old-fashioned term for 'pious').
'number' becomes 'no' (abbreviation for 'number').
'brings in' means one lot of letters goes inside another.
'pi'+'no'='pino'
'pino' placed around 'a' is 'PIANO'.

(Other definitions for piano that I've seen before include "Opposite of forte" , "Quiet (music)" , "In musical notation, this means softly" , "Keyboard instrument" , "Upright type?" .)

I've seen this clue in The Guardian.
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