One in yellow family of monkeys trapped by kid (7)
I believe the answer is:
simpson
'one in yellow family' is the definition.
The definition suggests a singular noun which matches the answer.
'monkeys trapped by kid' is the wordplay.
'monkeys' becomes 'imps' (both can mean mischievous children).
'trapped by' is an insertion indicator.
'kid' becomes 'son' (male child).
'imps' inserted inside 'son' is 'SIMPSON'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for simpson that I've seen before include "who caused constitutional crisis?" , "Homer - - (TV cartoon)" , "Maggie? Possibly" , "Wallis - (Edward VII)" , "One of cult cartoon family" .)