Disliked newcomer stumped in superior role (7)
I believe the answer is:
upstart
'disliked newcomer' is the definition.
'upstart' can be an answer for 'newcomer' (I have seen 'Arrogant newcomer ' mean 'upstart' so perhaps 'newcomer' could also mean 'upstart'). I am unsure of the 'disliked' bit.
'stumped in superior role' is the wordplay.
'stumped' becomes 'st' (cricket abbreviation).
'in' means one lot of letters goes inside another.
'superior' becomes 'U' (U can mean upper-class, as in U and non-U speech).
'role' becomes 'part' (eg a part or role in a film).
'u'+'part'='upart'
'st' put into 'upart' is 'UPSTART'.
Can you help me to learn more?
(Other definitions for upstart that I've seen before include "Pipsqueak" , "Arrogant Johnny-come-lately" , "Nouveau-riche" , "Person who behaves arrogantly in the new position" , "Arriviste, parvenu" .)