The most common and most likely answer to this crossword clue is the 10 letter word STENOTYPES
I've seen this crossword clue in Financial Times
S
T
E
N
O
T
Y
P
E
S
Buddy explains!

The straight part
We know that "Old word processors" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case old word processors = stenotypes.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 STENOTYPES mean?
STENOTYPES noun- A keyboard machine used to record a version of shorthand using a series of phonetic symbols.
- Any of the characters used in this shorthand system.