Crossword Genius

Exceptionally vain girl's instrument (8)

Ross

I believe the answer is:

virginal

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

'exceptionally vain girl's' is the wordplay.
'exceptionally' indicates anagramming the letters.
'vain'+'girl'='vaingirl'
'vaingirl' is an anagram of 'VIRGINAL'.

(Other definitions for virginal that I've seen before include "Pure - very early keyboard instrument" , "Antique keyboard" , "spotless" , "Untouched - old keyboard instrument" , "Unblemished" .)

I've seen this clue in The Telegraph.
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