Tired one in 10 can kip over (9)
I believe the answer is:
knackered
'tired' is the definition.
'one in 10 can kip over' is the wordplay.
'one in 10' becomes 'derek' (Bo Derek, actor in the film Ten).
'kip' becomes 'k' (symbol for the currency of Laos).
'over' is a reversal indicator.
'derek'+'can'+'k'='derekcank'
'derekcank' back-to-front is 'KNACKERED'.
(Other definitions for knackered that I've seen before include "Worn out" , "Exhausted (slang)" .)