The most common and most likely answer to this crossword clue is the 8 letter word NORSEMAN
I've seen this crossword clue in Independent
N
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M
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N
More clues leading to the result NORSEMAN
- Old Scandinavian identifies chap from the south
- Munch perhaps on remains one’s left decomposing
- Mounted soldier’s chief replaced by new Scandinavian invader
- Rising reputation’s right concerning Viking
- Longship Raider’s new jockey losing lead
- One invader or another seen around the Hastings region
- Ron names wandering Scandinavian
- Old Scandinavian calls Hollywood’s Howard back
Buddy explains!

The straight part
We know that "Munch perhaps" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case munch perhaps = norseman.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.