The most common and most likely answer to this crossword clue is the 6 letter word PLANER
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Buddy explains!
The straight part
We know that "Carpenter’s tool" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case carpenter’s tool = planer.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 PLANER mean?
PLANER adjective- Of a surface: flat or level.
- A woodworking tool which smooths a surface or makes one surface of a workpiece parallel to the tool's bed.
- A large machine tool in which the workpiece is traversed linearly (by means of a reciprocating bed) beneath a single-point cutting tool. (Analogous to a shaper but larger and with the workpiece moving instead of the tool.) Planers can generate various shapes, but were most especially used to generate large, accurate flat surfaces. The planer is nowadays obsolescent, having been mostly superseded by large milling machines.
- A wooden block used for forcing down the type in a form, and making the surface even.