Crossword Genius

Room with old instrument (5)

Ross

I believe the answer is:

cello

'instrument' is the definition.
(cello is a kind of instrument)

'room with old' is the wordplay.
'room' becomes 'cell' (cell is a kind of room**).
'with' is a charade indicator (letters next to each other).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'cell'+'o'='CELLO'

(Other definitions for cello that I've seen before include "Tortelier's instrument" , "Musical instrument like large violin held between knees" , "Orchestral instrument played between the legs" , "Large stringed instrument" , "Casals' instrument" .)

I've seen this clue in The Mirror.
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