About two to mend (6)
I believe the answer is:
repair
'mend' is the definition.
('repair' can be a synonym of 'mend')
'about two' is the wordplay.
'about' becomes 're' (regarding).
'two' becomes 'pair' (pair is a kind of two).
're'+'pair'='REPAIR'
'to' acts as a link.
(Other definitions for repair that I've seen before include "Mend - go" , "Restore, set right" , "Restore (something) to good condition" , "Proceed - restore" , "Withdraw" .)