Julia Roberts plays ____ Brockovich in a 2000 film (4)
I believe the answer is:
erin
'julia roberts' is the definition.
The definition suggests a singular noun which matches the answer.
'plays brockovich in a 2000 film' is the wordplay.
I cannot quite see how this works, but
'in' is found in the answer.
The remaining letters 'er' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for erin that I've seen before include "country" , "Literary term for Ireland" , "that faces Atlantic" , "Poetically, Ireland" , "(Literary name for) Ireland" .)