Cryptic crossword clue
Turning in century, man in game’s making a score 7

The most common and most likely answer to this crossword clue is the 7 letter word NICKING

I've seen this crossword clue in The Guardian
N
I
C
K
I
N
G

Buddy explains!

The straight part
We know that "making a score" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case making a score = nicking.
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 NICKING mean?

NICKING verb
  1. To make a nick or notch in; to cut or scratch in a minor way.
  2. To fit into or suit, as by a correspondence of nicks; to tally with.
  3. To make a cut at the side of the face.
  4. To steal.
  5. (law enforcement) To arrest.
NICKING verb
  1. To give or call (someone) by a nickname; to style.
NICKING noun
  1. The cutting made by the hewer at the side of the face.

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