Inspiration from cleaner at office (5)
I believe the answer is:
erato
'inspiration' is the definition.
(one of the muses in Greek mythology)
'from cleaner at office' is the wordplay.
'from' indicates a hidden word.
'ERATO' is hidden in the letters of 'cleaner at office'.
(Other definitions for erato that I've seen before include "Arts patron" , "One inspiring" , "Who may have inspired poetry" , "Poet's muse" , "poetical inspiration" .)