Upsetting her makes Ian late (7)
I believe the answer is:
natalie
'upsetting her' is the definition.
I can't judge whether this definition defines the answer.
'makes ian late' is the wordplay.
'makes' indicates anagramming the letters.
'ian'+'late'='ianlate'
'ianlate' anagrammed gives 'NATALIE'.
Can you help me to learn more?
(Other definitions for natalie that I've seen before include "Wood perhaps" , "female name" , "girl" , "Girl's name" .)