Tell us if Tony gets upset (6)
I believe the answer is:
notify
'tell us' is the definition.
'notify' can be an answer for 'tell' (I've seen this in another clue). I am not certain of the 'us' bit.
'if tony gets upset' is the wordplay.
'gets upset' indicates anagramming the letters (I've seen 'getting upset' mean this).
'if'+'tony'='iftony'
'iftony' is an anagram of 'NOTIFY'.
Can you help me to learn more?
(Other definitions for notify that I've seen before include "'Advise, tell about (6)'" , "Officially inform" , "No one" , "Make known" , "Declare" .)