One had, in manner of speaking and lying, to be clumsy? (8,5)
I believe the answer is:
accident prone
'be clumsy?' is the definition.
(I've seen this before)
'one had in manner of speaking and lying' is the wordplay.
'one had' becomes 'Id' ('I'd' can mean 'one had').
'in' indicates putting letters inside.
'manner of speaking' becomes 'accent' (accent is a kind of manner of speaking).
'and' means one lot of letters go next to another.
'lying' becomes 'prone' (I've seen this before).
'id' put into 'accent' is 'accident'.
'accident'+'prone'='ACCIDENT-PRONE'
'to' acts as a link.
(Other definitions for accident prone that I've seen before include "Tending to have mishaps" , "Subject to mishap" , "Being careless" , "clumsy?" , "likely to make a slip" .)