Title role in 'Shrek' originally recalled (3)
I believe the answer is:
'title' is the definition.
(I've seen this before)
'role in shrek originally recalled' is the wordplay.
'originally' indicates taking the first letters.
'recalled' says the letters should be written in reverse.
The initial letters of 'role in shrek' is 'ris'.
'ris' written backwards gives 'SIR'.
(Other definitions for sir that I've seen before include "Title given to 10 Across" , "Honorary male title" , "address to teacher" , "... ___ John Major" , "Title of Kt or Bart" .)