Turn puce with anger about children's latest "allergy" (10)
I believe the answer is:
repugnance
'allergy' is the definition.
(thesaurus)
'turn puce with anger about children's latest' is the wordplay.
'turn' is an anagram indicator.
'with' means one lot of letters go next to another.
'about' is an insertion indicator.
'latest' suggests the final letters.
The final letter of 'children' is 'n'.
'puce' put after 'anger' is 'angerpuce'.
'angerpuce' with letters rearranged gives 'repugnace'.
'repugnace' enclosing 'n' is 'REPUGNANCE'.
(Other definitions for repugnance that I've seen before include "Intense disgust" , "Offended aversion" , "Distaste" .)