Overheard the figure (3)
I believe the answer is:
two
'figure' is the definition.
(two is a number)
'overheard the' is the wordplay.
I cannot quite understand how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
The remaining letters 'wo' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for two that I've seen before include "Company allegedly" , "Pair; hour after lunch" , "limited company?" , "'It takes ? to tango'" , "Minimal number of partners" .)