Hendrix, regularly loud, rocks building (7)
I believe the answer is:
edifice
'building' is the definition.
(I know that building can be written as edifice)
'hendrix regularly loud rocks' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'loud' becomes 'f' (short for forte - 'loud' in music).
'rocks' becomes 'ice' (both can informally mean diamonds).
The alternating letters of 'hendrix' are 'edi'.
'edi'+'f'+'ice'='EDIFICE'
(Other definitions for edifice that I've seen before include "'Large, imposing building (7)'" , "Permanent building" , "Fine building" , "Grand building" , "Large structure" .)