Maid upset over starting trouble, you’ll agree (5)
I believe the answer is:
admit
'agree' is the definition.
(thesaurus)
'maid upset over starting trouble' is the wordplay.
'upset' is an anagram indicator.
'over' means one lot of letters go next to another.
'starting' says to take the initial letters.
The first letter of 'trouble' is 't'.
'maid' anagrammed gives 'admi'.
'admi'+'t'='ADMIT'
'you'll' is the link.
I am not very happy about this link. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for admit that I've seen before include "Take on" , "Accept" , "Profess" , "Allow entry" , "Allow to enter; own up" .)