Try a case of typist embracing office worker (7)
I believe the answer is:
attempt
'try' is the definition.
('attempt' can be a synonym of 'try')
'a case of typist embracing office worker' is the wordplay.
'case of' means to remove the middle letters (outsides of).
'embracing' means one lot of letters goes inside another.
'office worker' becomes 'temp' (I've seen this before).
'typist' with its middle removed is 'tt'.
'tt' enclosing 'temp' is 'ttempt'.
'a'+'ttempt'='ATTEMPT'
(Other definitions for attempt that I've seen before include "Endeavor, try" , "Shot" , "Have a crack" , "Embark on, try" , "bash" .)