Prince getting worried talked rubbish (8)
I believe the answer is:
prattled
'talked rubbish' is the definition.
'prince getting worried' is the wordplay.
'prince' becomes 'p'.
'getting' means one lot of letters go next to another.
'worried' becomes 'rattled' (to rattle someone is to unnerve or worry them).
'p'+'rattled'='PRATTLED'
(Other definitions for prattled that I've seen before include "Wittered on" , "Chattered" .)