Lid came off in examination? (7)
I believe the answer is:
medical
'examination?' is the definition.
(I know that medical is a type of examination)
'lid came off' is the wordplay.
'off' indicates anagramming the letters.
'lid'+'came'='lidcame'
'lidcame' with letters rearranged gives 'MEDICAL'.
'in' acts as a link.
(Other definitions for medical that I've seen before include "Check-up - declaim (anag)" , "Relating to the art of healing" , "Relating to doctors" , "Relating to treatment rather than surgery" , "Of the healing sciences" .)