Have no change when about to start work (3)
I believe the answer is:
own
'have' is the definition.
(to have something is to own it)
'no change when about to start work' is the wordplay.
'change' is an anagram indicator.
'when about' is an insertion indicator.
'to start' says to take the initial letters.
The first letter of 'work' is 'w'.
'no' anagrammed gives 'on'.
'on' placed around 'w' is 'OWN'.
(Other definitions for own that I've seen before include "Private" , "Be in legal possession of (3)" , "Allow" , "Posses" , "Acknowledge" .)