Poems about a sick French king's palace (10)
I believe the answer is:
versailles
'french king's palace' is the definition.
'versailles' can be an answer for 'palace' (I've seen this before). I am not certain of the 'french king's' bit.
'poems about a sick' is the wordplay.
'poems' becomes 'verses' (verse is a kind of poem).
'about' is an insertion indicator.
'sick' becomes 'ill' (synonyms).
'a'+'ill'='aill'
'verses' enclosing 'aill' is 'VERSAILLES'.
Can you help me to learn more?
(Other definitions for versailles that I've seen before include "Palace near Paris" , "French palace" , "Royal Court" , "Palace built by Louis XIV" , "Louis XIV's palace; WW one treaty" .)