Scholarly man new to his organisation (7)
I believe the answer is:
donnish
'scholarly' is the definition.
(similar in meaning)
'man new to his organisation' is the wordplay.
'man' becomes 'don' (Don is an example).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'organisation' indicates an anagram.
'his' is an anagram of 'ish'.
'don'+'n'+'ish'='DONNISH'
(Other definitions for donnish that I've seen before include "Like fellow, perhaps" , "Scholarly" , "Typical of lecturer" , "Lecturer probably is" , "Like a college teacher" .)