When out of cash, workers split wrapping paper (9)
I believe the answer is:
parchment
'paper' is the definition.
(I know that parchment is a type of paper)
'when out of cash workers split wrapping' is the wordplay.
'when out of' becomes 'rch' (I can't explain this - if you can you should give a lot more credence to this answer).
'cash' becomes 'Pat' (tennis player Pat Cash).
'workers' becomes 'men' (men can mean staff or employees).
'split' means one lot of letters goes inside another (some letters split a word into two).
'wrapping' is an insertion indicator.
'pat' going around 'men' is 'pament'.
'rch' inserted into 'pament' is 'PARCHMENT'.
(Other definitions for parchment that I've seen before include "Paper made from animal skin" , "High-quality paper" , "diploma" , "Work on skin" , "quality paper" .)