For which the examinee is always late! (7)
I believe the answer is:
autopsy
'for which the examinee is always late' is the definition.
The definition suggests a singular noun which matches the answer.
'for' is the wordplay.
I cannot really understand how this works, but
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for autopsy that I've seen before include "Examination after death, a post-mortem" , "Far from quick examination" , "final examination" , "A post-mortem examination of corpse" , "Post-mortem inspection" .)