Cryptic crossword clue
Miners’ group is to register in spring, collecting 17 13

The most common and most likely answer to this crossword clue is the 13 letter word NUMISMATOLOGY

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

The straight part
We know that "collecting 17" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case collecting 17 = numismatology.
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 NUMISMATOLOGY mean?

NUMISMATOLOGY noun
  1. Numismatics

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