He could be confused with Arnold or Roland (6)
I believe the answer is:
ronald
'he' is the definition.
'be confused with arnold or roland' is the wordplay.
'arnold' anagrams to 'RONALD'.
But, I am not sure how the anagram is indicated.
'could' acts as a link.
Can you help me to learn more?
(Other definitions for ronald that I've seen before include "Mr Reagan" , "The late President Reagan" , "Chap" , ". . . . . . Reagan, former US president" .)