The most common and most likely answer to this crossword clue is the 3 plus 3 letter word MAP OUT
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More clues leading to the result MAP OUT
- Parent with sullen look making plan
- Little Mary about to cross a river — plan needed
- Plan for elephant keeper to be given parking avoiding hospital
- Sketch makes mother pull a face
- Be lippy having to follow master plan
- Plan for mother and brood
- Rising corporation poaching American banker’s design
- Massachusetts post office upset with evacuation plan
Buddy explains!

The straight part
We know that "plan needed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case plan needed = map out.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.