Tipping point found wanting in two shakes? (4,5)
I believe the answer is:
last straw
'tipping point' is the definition.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for last straw that I've seen before include "Camel's back breaker" , "One too many perhaps" , "Start laws (anag) ? breaking point?" , "ultimate irritation" , "Small event finally causing a problem" .)