Absolutely lucid, recall stay abroad with monarch (7,5)
I believe the answer is:
crystal-clear
'absolutely lucid' is the definition.
(completely clear or lucid)
'recall stay abroad with monarch' is the wordplay.
'abroad' indicates anagramming the letters (abroad can mean moving around).
'with' says to put letters next to each other.
'monarch' becomes 'CR' (short for Carolus Rex, King Charles in Latin).
'recall'+'stay'='recallstay'
'recallstay' is an anagram of 'ystalclear'.
'ystalclear' after 'cr' is 'CRYSTAL-CLEAR'.
(Other definitions for crystal-clear that I've seen before include "Pellucid" , "In need of no further explanation" , "Easy to understand" , "Completely unclouded" , "Completely transparent" .)