Crossword Genius

One taking a bow when first in some vivas in biology (4,4)


I believe the answer is:

bass viol

'one taking a bow' is the definition.
(instrument played with a bow)

'when first in some vivas in biology' is the wordplay.
'when' becomes 'as' (eg 'when I walked' means 'as I walked').
'first in' suggests taking the first letters.
'in' indicates putting letters inside.
'biology' becomes 'biol' (abbreviation).
The first letters of 'some vivas' is 'sv'.
'assv' inserted into 'biol' is 'BASS VIOL'.

I've seen this clue in The Times.
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