The most common and most likely answer to this crossword clue is the 10 letter word DRIP-DRIED
I've seen this crossword clue in Financial Times
D
R
I
P
-
D
R
I
E
D
Buddy explains!
The straight part
We know that "hung up on other line" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hung up on other line = drip-dried.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 DRIP-DRIED mean?
DRIP-DRIED verb- To dry by hanging up wet.