I'm not sure journalist's stalking ability is exhausted (9)
I believe the answer is:
knackered
'is exhausted' is the definition.
(I've seen this before)
'i'm not sure journalist's stalking ability' is the wordplay.
I cannot really understand how this works, but
'ability' could be 'knack' (knack is a kind of ability) and 'knack' is found in the answer.
'journalist' could be 'ed' (short for editor) and 'ed' is found within the answer.
'i'm not sure' could be 'er' (expression of hesitation) and 'er' is found in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for knackered that I've seen before include "Worn out" , "Exhausted (slang)" .)