Workplace no longer shelved? (6)

I believe the answer is:

office

I'm a little stuck... Click here to teach me more about this clue!

'workplace' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for office that I've seen before include "Department" , "Position, or building in which colours in layers" , "Firm" , "Workplace for clerks" , "Workroom" .)

I've seen this clue in The Irish Times.

Want a hint initially instead of a full solution? Install my app