Beginning with name when meeting US lawyer (4)
I believe the answer is:
dawn
'beginning' is the definition.
(dawn is a kind of beginning)
'with name when meeting us lawyer' is the wordplay.
'with' becomes 'w' (abbreviation).
'name' becomes 'n' (common abbreviation e.g. on forms).
'when meeting' says to put letters next to each other.
'us lawyer' becomes 'DA' (abbreviation for District Attorney).
'w'+'n'='wn'
'wn' put after 'da' is 'DAWN'.
(Other definitions for dawn that I've seen before include "fresh start" , "Threshold" , "Light in East" , "Sunrise" , "Aurora was its goddess" .)