Cryptic crossword clue
Underground workers using dogs to catch snooper finally 8

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

I've seen this crossword clue in The Times
C
O
L
L
I
E
R
S

Buddy explains!

The straight part
We know that "Underground workers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case underground workers = colliers.
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 COLLIERS mean?

COLLIERS noun
  1. A person in the business or occupation of producing (digging or mining) coal or making charcoal or in its transporting or commerce.
  2. A vessel carrying a bulk cargo of coal.
  3. A sailor on such a vessel.
  4. (used by the traveller community) A non-traveller.

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