Popular copper, Bell, upset about father being blameless? (10)

'blameless?' is the definition.
(I know that blameless can be written as inculpable)

'popular copper bell upset about father' is the wordplay.
'popular' becomes 'in' ('in' can mean trendy).
'copper' becomes 'cu' (chemical symbol).
'upset' indicates anagramming the letters.
'about' indicates putting letters inside.
'father' becomes 'pa' (pa can mean dad or father).
'bell' with letters rearranged gives 'lble'.
'lble' placed around 'pa' is 'lpable'.
'in'+'cu'+'lpable'='INCULPABLE'

'being' acts as a link.