Birthplace of rock? (6)
I believe the answer is:
cradle
I believe this is a double definition.
'birthplace' is the first definition.
('cradle' can be a synonym of 'birthplace')
'rock?' is the second definition.
('cradle' can be a synonym of 'rock')
'of' acts as a link.
(Other definitions for cradle that I've seen before include "Baby's bed" , "Hold lovingly" , "Baby's cot" , "Hold tenderly" , "Supporting framework" .)