Cryptic crossword clue
As a system of counting, doctor aided locum 10

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

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

The straight part
We know that "a system of counting" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a system of counting = duodecimal.
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 DUODECIMAL mean?

DUODECIMAL noun
  1. A number system that uses twelve as its base.
DUODECIMAL adjective
  1. Of a number, expressed in base twelve.

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