Townsman’s spot over in nice development (7)
I believe the answer is:
citizen
'townsman's' is the definition.
(thesaurus)
'spot over in nice development' is the wordplay.
'spot' becomes 'zit' (spot on one's body).
'over' shows that the letters should be reversed in order.
'in' indicates putting letters inside.
'development' indicates an anagram.
'zit' back-to-front is 'tiz'.
'nice' anagrammed gives 'cien'.
'tiz' inserted within 'cien' is 'CITIZEN'.
(Other definitions for citizen that I've seen before include "Subject; townsman" , "One belonging to a specific town or country" , "eg Londoner" , "Member of community" , "Legally recognised national of a country" .)