Get better workers in a time leading to change (9)
I believe the answer is:
amendment
'change' is the definition.
(amendment is a kind of change)
'get better workers in a time leading' is the wordplay.
'get better' becomes 'mend' ('mend' can be a synonym of 'get better'**).
'workers' becomes 'men' (man is a kind of worker).
'in' indicates putting letters inside.
'leading' indicates taking the first letters.
The initial letter of 'time' is 't'.
'mend'+'men'='mendmen'
'a'+'t'='at'
'mendmen' placed into 'at' is 'AMENDMENT'.
'to' is the link.
(Other definitions for amendment that I've seen before include "change for the better" , "Minor improvement" , "Alteration made in a formal document" , "Corrective treatment" , "Addition or alteration, to a motion or official document, say" .)