Worker is after fraction - hardly new (9)
I believe the answer is:
thirdhand
'hardly new' is the definition.
I can't tell whether this definition defines the answer.
'worker is after fraction' is the wordplay.
'worker' becomes 'hand' (hand is a kind of worker).
'is after' means one lot of letters go next to another.
'fraction' becomes 'third' (third is a kind of fraction).
'hand' after 'third' is 'THIRDHAND'.
Can you help me to learn more?
(Other definitions for thirdhand that I've seen before include "(Of information) indirectly" , "With two previous owners" .)