Calmly start to live in US city with first lady (6)
I believe the answer is:
evenly
'calmly' is the definition.
(I've seen this before)
'start to live in us city with first lady' is the wordplay.
'start to' suggests taking the first letters.
'in' is an insertion indicator.
'us city' becomes 'ny' (I've seen this in other clues**).
'with' is a charade indicator (letters next to each other).
'first lady' becomes 'eve' (I've seen this before).
The initial letter of 'live' is 'l'.
'l' inserted inside 'ny' is 'nly'.
'nly' after 'eve' is 'EVENLY'.
(Other definitions for evenly that I've seen before include "on an equal footing" , "Smoothly, regularly" , "In measured and level way" , "(Spread) without irregularities" , "Smoothly or impartially" .)