Cryptic crossword clue
Undid gym pants getting dirty 8

The most common and most likely answer to this crossword clue is the 8 letter word MUDDYING

M
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Buddy explains!

The straight part
We know that "getting dirty" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case getting dirty = muddying.
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 MUDDYING mean?

MUDDYING verb
  1. To get mud on (something).
  2. To make a mess of, or create confusion with regard to; to muddle.
MUDDYING noun
  1. The process of making something muddy or obscure.

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