Cryptic crossword clue
Your aunt felt badly about cousin’s final letter, alas 13

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

I've seen this crossword clue in The Sunday Telegraph
U
N
F
O
R
T
U
N
A
T
E
L
Y

Buddy explains!

The straight part
We know that "alas" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case alas = unfortunately.
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.

Crossword Answer definitions

UNFORTUNATELY adverb
  1. Happening through bad luck, or because of some unfortunate event.
  2. Used (as a parenthetical word) to express disappointment, compassion, sorrow, regret or grief.

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