Carried over by workmates, nice small picture (5)
I believe the answer is:
inset
'small picture' is the definition.
(I've seen this before)
'carried over by workmates nice' is the wordplay.
'over' says the letters should be written backwards.
'carried' indicates the answer is hidden within the clue.
'tesni' is hidden in the letters of 'by workmates nice'.
'tesni' written backwards gives 'INSET'.
(Other definitions for inset that I've seen before include "Tines (anag.)" , "Small picture placed within a larger one" , "Picture placed within another" , "Photographic cameo superimposed on to another print" , "Small picture inserted within a larger one" .)