Cryptic crossword clue
Fellow’s skill with diagrams – thus his grand map may take shape 15

The most common and most likely answer to this crossword clue is the 15 letter word DRAUGHTSMANSHIP

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "Fellow’s skill with diagram/s/s/o" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fellow’s skill with diagram/s/s/o = draughtsmanship.
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.

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