Cryptic crossword clue
Confirms advance on stint at sea fighting 13

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

I've seen this crossword clue in The Daily Telegraph
S
U
B
S
T
A
N
T
I
A
T
E
S

Buddy explains!

The straight part
We know that "Confirms" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case confirms = substantiates.
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 SUBSTANTIATES mean?

SUBSTANTIATES verb
  1. To verify something by supplying evidence; to authenticate or corroborate
  2. To give material form or substance to something; to embody; to record in documents

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