Copy held in Wisbech office (4)
I believe the answer is:
echo
'copy' is the definition.
(echo can mean a copy or duplication)
'held in wisbech office' is the wordplay.
'held in' indicates the answer is hidden within the clue.
'ECHO' is hidden in the letters of 'wisbech office'.
(Other definitions for echo that I've seen before include "Parrot" , "Nymph; E (radio comms.)" , "Repeating of sound" , "Close imitation" , "One who slavishly copies" .)