Anyone prone to get upset about a slow start (6)
I believe the answer is:
person
'anyone' is the definition.
I can't tell whether this defines the answer.
'prone to get upset about a slow start' is the wordplay.
'to get upset' indicates anagramming the letters (I've seen 'getting upset' mean this).
'about' means one lot of letters goes inside another.
'start' indicates taking the first letters.
The initial letter of 'slow' is 's'.
'prone' is an anagram of 'peron'.
'peron' enclosing 's' is 'PERSON'.
Can you help me to learn more?
(Other definitions for person that I've seen before include "present appearing in this" , "anyone else" , "Bod" , "Individual human being" , "he's the third" .)