Hello!
Here is the following sentence:
"... Rosemary had been married two years. She had a duck of a boy. No, not Peter - Michael. And her husband absolutely adored her..".
("A Cup of Tea" by Katherine Mansfield)
What does "she had a duck of a boy" mean?
Thank you!
Have a look at this link, and see if it helps: ducky adjective - definition in British English Dictionary & Thesaurus - Cambridge Dictionary Online