Extemporise with part-timer (4)
I believe the answer is:
temp
'part-timer' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'extemporise with' is the wordplay.
'with' indicates the answer is hidden within the clue.
'TEMP' is hidden in the letters of 'extemporise'.
Can you help me to learn more?
(Other definitions for temp that I've seen before include "Non-full time employee" , "N on-permanent worker" , "Short-time worker" , "Transitory office worker" , "Non-permanent worker" .)