Different dam, miles away (5)
I believe the answer is:
other
'different' is the definition.
(similar in meaning)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for other that I've seen before include "Different; alternate" , "Different (from those mentioned)" , "Different, not the same one or this one" , "not like you" , "Remaining" .)