Doctor very engaged in genuine excision (7)
I believe the answer is:
removal
'excision' is the definition.
(thesaurus)
'doctor very engaged in genuine' is the wordplay.
'doctor' becomes 'mo' (medical officer).
'very' becomes 'v' (abbreviation).
'engaged in' indicates putting letters inside.
'genuine' becomes 'real' (associated in meaning).
'mo'+'v'='mov'
'mov' going inside 'real' is 'REMOVAL'.
(Other definitions for removal that I've seen before include "purge" , "Ejection" , "Sack" , "The taking (of something) to another place" , "These vans dispatch your house contents" .)