Cryptic crossword clue
Nostalgic chap mailed a catalogue, including old boys in it 14

The most common and most likely answer to this crossword clue is the 14 letter word SENTIMENTALIST

I've seen this crossword clue in The Sunday Telegraph
S
E
N
T
I
M
E
N
T
A
L
I
S
T

Buddy explains!

The straight part
We know that "Nostalgic chap" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case nostalgic chap = sentimentalist.
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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