Violin in the virtuoso's tradition (5)
I believe the answer is:
strad
'violin' is the definition.
(Stradivari abbreviation)
'in the virtuoso's tradition' is the wordplay.
'in' indicates a hidden word.
'STRAD' is hidden in the letters of 'virtuosos tradition'.
(Other definitions for strad that I've seen before include "musical instrument" , "Top-quality violin (abbr.)" , "Valuable violin (colloq.)" , "fiddle exposed" , "Valuable old violin" .)