Carefree youth with a woman trapping American lawyer on board a ship (5,4)
I believe the answer is:
Here is my best explanation:
'carefree youth' is the definition.
(I've seen this before)
'a woman trapping american lawyer on board a ship' is the wordplay.
'woman' becomes 'lady' (lady is a kind of woman**).
'trapping' is an insertion indicator.
'american lawyer' becomes 'da' (abbreviation for District Attorney).
'on board' indicates putting letters inside.
'a ship' becomes 'ss'.
'lady' enclosing 'da' is 'ladday'.
'aladday' put inside 'ss' is 'saladdays'.
'with' is the link.
(Other definitions for salad days that I've seen before include "inexperienced youth", "times when she was young", "when one is young?", "Time for a vegetarian diet", "Carefree youth", "Period of youth and inexperience - ate lettuce dishes?", "Best time of youth", "Green term", "Youthful period - when one is "green in judgment, cold in blood" (Antony & Cleopatra" and "Period of youth and inexperience - on lettuce diet?".)