Lady married the first man that appeared (4)
I believe the answer is:
adam
'first man that appeared' is the definition.
'adam' can be an answer for 'first man' (first man in the Bible). I'm not certain of the rest of the definition.
'lady married' is the wordplay.
'lady' becomes 'ada' ().
'married' becomes 'm' (abbreviation, e.g. in genealogy).
'ada'+'m'='ADAM'
'the' acts as a link.
Can you help me to learn more?
(Other definitions for adam that I've seen before include "first in the race?" , "Man on the ceiling of the Sistine Chapel" , "who transformed Palladian architecture?" , "who transformed the Palladian style?" , "First Christian ancestor" .)