Lying after chance to be clumsy (8,5)
I believe the answer is:
accident prone
'be clumsy' is the definition.
(likely to have accidents)
'lying after chance' is the wordplay.
'lying' becomes 'prone' (I've seen this before).
'after' says to put letters next to each other.
'chance' becomes 'accident' (I've seen this in another clue).
'prone' put after 'accident' is 'ACCIDENT-PRONE'.
'to' is the link.
(Other definitions for accident prone that I've seen before include "likely to crash?" , "likely to make a slip" , "Being careless" , "Tending to have mishaps" , "susceptible to injury" .)