Cryptic crossword clue
Sailors being underway, viewers heard update 9

The most common and most likely answer to this crossword clue is the 9 letter word MODERNIZE

I've seen this crossword clue in Financial Times
M
O
D
E
R
N
I
Z
E

Buddy explains!

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

MODERNIZE verb
  1. To make (something old or outdated) up to date, or modern in style or function by adding or changing equipment, designs, etc.
  2. To become modern in appearance, or adopt modern ways

Latest crossword clues with full explanations