Grand boy, taking violin out of case, blossoms (8)
I believe the answer is:
gladioli
'blossoms' is the definition.
(type of flower)
'grand boy taking violin out of case' is the wordplay.
I cannot quite understand how this works, but
'grand' could be 'g' (G is short for grand as in a thousand) and 'g' is found within the answer.
'boy' could be 'ad' and 'ad' is present in the answer.
'of' could be 'o' and 'o' is found within the answer.
The remaining letters 'lili' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
(Other definitions for gladioli that I've seen before include "I laid log in the flowers" , "Did the Iliad log out these flowers?" , "Some of Iris's family" , "Plant with brightly coloured, funnel-shaped flowers" , "Tall garden flowers" .)