Show a busy worker into the office (5)
I believe the answer is:
panto
'show' is the definition.
(I've seen this before)
'worker into the office' is the wordplay.
'worker' becomes 'ant' (worker is a type of ant).
'into' means one lot of letters goes inside another.
'the office' becomes 'po' (I can't explain this - if you can you should believe this answer much more).
'ant' going into 'po' is 'PANTO'.
'a busy' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for panto that I've seen before include "Christmas show" , "festive entertainment" , "theatrical work" , "Cinderella or Puss in Boots, say?" , "Slapstick theatre for children (abbr)" .)