Clan returns in middle of Durham revival (7)
I believe the answer is:
rebirth
'revival' is the definition.
(I know that rebirth is a type of revival)
'clan returns in middle of durham' is the wordplay.
'clan' becomes 'tribe' (synonyms).
'returns' says the letters should be written backwards.
'in' is an insertion indicator.
'middle of' says to take the centre.
The middle of 'durham' is 'rh'.
'tribe' back-to-front is 'ebirt'.
'ebirt' placed inside 'rh' is 'REBIRTH'.
(Other definitions for rebirth that I've seen before include "Renaissance" , "spiritual enlightenment" , "Renascence" , "Spiritual renewal" , "second coming" .)