Relax with First Lady on top of mountain (7)
I believe the answer is:
everest
'mountain' is the definition.
(Mount Everest)
'relax with first lady on top' is the wordplay.
'relax with' becomes 'rest' (to relax is to have a rest. I am not sure about the 'with' bit.).
'first lady' becomes 'eve' (first woman in the Bible).
'on top' means one lot of letters go next to another (in a down clue, some letters go above others).
'rest' after 'eve' is 'EVEREST'.
'of' is the link.
Can you help me to learn more?
(Other definitions for everest that I've seen before include "A high spot" , "Tallest mountain ..." , "Highest peak" , "Himalayan mount" , "Great achievement" .)