Breaking hand, return to a bit of carpentry (5,5)
I believe the answer is:
Here is my best explanation:
'bit of carpentry' is the definition.
'breaking hand return to' is the subsidiary indication.
'breaking' indicates putting letters inside.
'hand' becomes 'mitt' ('mitt' can be a synonym of 'hand').
'return to' becomes 'rejoin'.
'mitt' enclosing 'rejoin' is 'mitrejoint'.
'a' is the link.