Perhaps 'Fingers' is contemptible figure in underworld (6)
I believe the answer is:
digits
'perhaps fingers' is the definition.
'digits' can be an answer for 'fingers' (I've seen this in another clue). I'm unsure of the 'perhaps' bit.
'contemptible figure in underworld' is the wordplay.
'contemptible figure' becomes 'git' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' is an insertion indicator.
'underworld' becomes 'dis' (underworld in classical mythology).
'git' inserted inside 'dis' is 'DIGITS'.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for digits that I've seen before include "One to nine" , "Fingers, toes and numbers" , "Numbers 0 to 9" .)