The most common and most likely answer to this crossword clue is the 6 plus 4 letter word DOMAIN NAME
I've seen this crossword clue in The Guardian
D
O
M
A
I
N
N
A
M
E
More clues leading to the result DOMAIN NAME
- Foremost dons moaned about contribution to online address
- Gathering chap raised in US state, address found online
- Set of labels dotted about, bearing the same important title
- theguardian.com is one no man made work
- Moan made in wrong part of www.theguardian.com
- Address Spooner’s absent leading lady
- Virtually this is what one goes by
- Made no blunders engaging chief for dot.com, perhaps?
Buddy explains!
The straight part
We know that "address found online" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case address found online = domain name.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.