Upset Ruth? Betcha they make up! (4,3,7)
I believe the answer is:
bury the hatchet
'make up' is the definition.
(I've seen this in another clue)
'upset ruth? betcha they' is the wordplay.
'upset' is an anagram indicator.
'ruth'+'betcha'+'they'='ruthbetchathey'
'ruthbetchathey' is an anagram of 'BURY THE HATCHET'.
(Other definitions for bury the hatchet that I've seen before include "Become reconciled" , "sinking of cutter" , "having decided against axing?" , "Settle quarrel" , "end feud - with 18d" .)