The most common and most likely answer to this crossword clue is the 7 letter word ONLINER
I've seen this crossword clue in The Times
O
N
L
I
N
E
R
Buddy explains!
The straight part
We know that "Surfer/enjoying a cruise?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case surfer/enjoying a cruise? = onliner.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 ONLINER mean?
ONLINER noun- A person who is online; a user of the Internet or similar service.