The most common and most likely answer to this crossword clue is the 7 letter word CLERKED
I've seen this crossword clue in The Guardian
C
L
E
R
K
E
D
Buddy explains!
The straight part
We know that "had job in office" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case had job in office = clerked.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 CLERKED mean?
CLERKED verb- To act as a clerk, to perform the duties or functions of a clerk