The most common and most likely answer to this crossword clue is the 8 letter word FLATMATE
I've seen this crossword clue in The Guardian
F
L
A
T
M
A
T
E
More clues leading to the result FLATMATE
- Dull ship’s officer, one sharing apartment
- Corpulent ship’s officer embracing large fellow lodger
- Would one share evenly?
- Companion in apartment lifeless, getting Mike worried
- Stout friend, about 50, who shares digs
- Fine source of cash concealed by former cohabitee
- Meat cooked by boring lodger perhaps
- Person lived with is monotonous and dull, with little energy
Buddy explains!

The straight part
We know that "who shares digs" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case who shares digs = flatmate.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 FLATMATE mean?
FLATMATE noun- A person with whom one shares a flat.
- A person with whom one shares any rental dwelling, not necessarily a flat.