Famous film director appearing outside by a strange large rodent (8)
I believe the answer is:
capybara
'large rodent' is the definition.
(I've seen this before)
'famous film director appearing outside by a strange' is the wordplay.
'famous film director' becomes 'capra'.
'appearing outside' means one lot of letters goes inside another.
'strange' is an anagram indicator.
'by'+'a'='bya'
'bya' is an anagram of 'yba'.
'capra' enclosing 'yba' is 'CAPYBARA'.
(Other definitions for capybara that I've seen before include "Largest rodent" , "Pay a crab (anag) - rodent" , "Large South American rodent" , "largest animal of its kind" .)