Former US President - R Reagan - mistakenly ignoring a backwoodsman (10)
I believe the answer is:
bushranger
'backwoodsman' is the definition.
(I've seen this before)
'former us president r reagan mistakenly ignoring a' is the wordplay.
I cannot quite understand how this works, but
'us' is present in the answer.
'r' is within the answer.
'a' could be 'an' and 'an' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for bushranger that I've seen is " backwoodsman".)