A figure's had a nought added to it, too (4)
I believe the answer is:
also
'too' is the definition.
(synonyms)
'a figure's had a nought added to' is the wordplay.
'figure's' becomes 'ls' (I've seen this in other clues).
'had' means one lot of letters go next to another.
'a nought' becomes 'O' (O resembles 0).
'added to' is a charade indicator (letters next to each other).
'a'+'ls'+'o'='ALSO'
'it' acts as a link.
This may not be right. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for also that I've seen before include "in accompaniment" , "on top" , "Furthermore" , "Plus" , "Item" .)