The most common and most likely answer to this crossword clue is the 6 letter word BINARY
I've seen this crossword clue in The Guardian
B
I
N
A
R
Y
Buddy explains!
The straight part
We know that "in two parts" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in two parts = binary.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 BINARY mean?
BINARY noun- A thing which can have only (one or the other of) two values.
- The bijective base-2 numeral system, which uses only the digits 0 and 1.
- An executable computer file.
- A satellite system consisting of two stars or other bodies orbiting each other.
- Being in a state of one of two mutually exclusive conditions such as on or off, true or false, molten or frozen, presence or absence of a signal.
- Concerning logic whose subject matter concerns binary states.
- Concerning numbers and calculations using the binary number system.
- Having two equally important parts; related to something with two parts.
- (computer engineering) Of an operation, function, procedure or logic gate, taking exactly two operands, arguments, parameters or inputs; having domain of dimension 2.
- Of data, consisting coded values (e.g. machine code) not interpretable as plain or ASCII text (e.g. source code).
- Focusing on two mutually exclusive conditions.