Dad's film as a pirate in trouble (13)
I believe the answer is:
paterfamilias
'dad's' is the definition.
(thesaurus)
'film as a pirate in trouble' is the wordplay.
'in trouble' indicates anagramming the letters.
'film'+'as'+'a'+'pirate'='filmasapirate'
'filmasapirate' is an anagram of 'PATERFAMILIAS'.
(Other definitions for paterfamilias that I've seen before include "Father as head of the household" , "Male head of a household" , "boss" , "Classically, the head of the household" .)