Cryptic crossword clue
Defector to Labour, say, pens chapter on eliminating waste 9

The most common and most likely answer to this crossword clue is the 9 letter word EXCRETORY

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "eliminating waste" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case eliminating waste = excretory.
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 EXCRETORY mean?

EXCRETORY noun
  1. A duct that helps to receive and excrete matter.
EXCRETORY adjective
  1. Of, or relating to excretion.

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