The most common and most likely answer to this crossword clue is the 10 letter word PROCEDURES
I've seen this crossword clue in The Daily Telegraph
P
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More clues leading to the result PROCEDURES
Buddy explains!

The straight part
We know that "methods" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case methods = procedures.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 PROCEDURES mean?
PROCEDURES noun- A particular method for performing a task.
- A series of small tasks or steps taken to accomplish an end.
- The set of established forms or methods of an organized body for accomplishing a certain task or tasks.
- The steps taken in an action or other legal proceeding.
- That which results; issue; product.
- A subroutine or function coded to perform a specific task.
- A surgical operation.