Evident former pupil, savage, has 101 removed (7)
I believe the answer is:
obvious
'evident' is the definition.
(similar in meaning)
'former pupil savage has 101 removed' is the wordplay.
I cannot quite see how this works, but
'former pupil' could be 'ob' (abbreviation for 'Old Boy') and 'ob' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for obvious that I've seen before include "Not subtle" , "Quite clear and manifest" , "Evident, plain" , "Easily perceived or understood" , "Patent" .)