Recent arrival’s renown at work captivates British (7)
I believe the answer is:
newborn
'recent arrival's renown at work captivates british' is the definition.
I can't judge whether this definition defines the answer.
'renown at work captivates british' is the wordplay.
'at work' indicates an anagram.
'captivates' is an insertion indicator (inserted letters are captured or captivated).
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'renown' with letters rearranged gives 'neworn'.
'neworn' enclosing 'b' is 'NEWBORN'.
Can you help me to learn more?
(Other definitions for newborn that I've seen before include "Just entered the world" , "Neonate" , "Young baby" , "Recently given birth to" , "Recently delivered" .)