Cryptic crossword clue
Bad smell stopped by one reasonable sort of detergent 10

The most common and most likely answer to this crossword clue is the 10 letter word BIOLOGICAL

I've seen this crossword clue in The Guardian
B
I
O
L
O
G
I
C
A
L

Buddy explains!

The straight part
We know that "sort of detergent" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sort of detergent = biological.
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 BIOLOGICAL mean?

BIOLOGICAL noun
  1. A biological product.
BIOLOGICAL adjective
  1. Of or relating to biology.
  2. Related by consanguinity, especially as to parents and children.
  3. (an error in NNES) Organic (grown without agrochemicals).

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