The most common and most likely answer to this crossword clue is the 7 letter word WOODMAN
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More clues leading to the result WOODMAN
Buddy explains!

The straight part
We know that "friend of Doroth" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case friend of doroth = woodman.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.
What does WOODMAN mean?
WOODMAN noun- Someone who hunts animals in a wood, hunter, huntsman.
- Someone who cuts down trees or cuts and sells wood, lumberjack, woodcutter.
- Someone who lives in the wood and manages it; a woodsman; (by extension) someone who spends time in the woods and has a strong familiarity with that environment.
- Someone who lives in the woods and is considered to be uncivilized or barbaric, a savage.
- Someone who makes things from wood.