Michael isn't exactly far away (7)
I believe the answer is:
faraday
'michael isn't exactly' is the definition.
I can't tell whether this defines the answer.
'far away' is the wordplay.
'away' becomes 'aday' (I can't explain this - if you can you should give a lot more credence to this answer).
'far'+'aday'='FARADAY'
Can you help me to learn more?
(Other definitions for faraday that I've seen before include "unit" , "Man of note" , "Michael -, nineteenth century English physicist and chemist" , "English physicist and chemist, d. 1867" , "Scientist" .)