Quick to take a break in the office (6)
I believe the answer is:
presto
'quick' is the definition.
(I've seen this before)
'a break in the office' is the wordplay.
'a break' becomes 'rest' (rest is a kind of break).
'in the' indicates putting letters inside.
'office' becomes 'po' (I can't justify this - if you can you should believe this answer much more).
'rest' going into 'po' is 'PRESTO'.
'to take' is the link.
Can you help me to learn more?
(Other definitions for presto that I've seen before include "Very fast (mus.)" , "Hey ..., said the magician" , "hey......,cries the magician" , "(In music) fast" , "quickly in bars" .)