Precocious little girl’s angry morning (5)
I believe the answer is:
madam
'precocious little girl's' is the definition.
(I've seen this before)
'angry morning' is the wordplay.
'angry' becomes 'mad' (similar in meaning).
'morning' becomes 'am' (as in 12:00 AM).
'mad'+'am'='MADAM'
(Other definitions for madam that I've seen before include "Woman of standing" , "Woman with status - girl with bad manners" , "How one may address a woman" , "formidable woman" , "Make wildly happy" .)