Conflict in group over head relinquishing power (3-2)
I believe the answer is:
'conflict' is the definition.
(set-to is a kind of conflict)
'in group over head relinquishing power' is the wordplay.
'in group' becomes 'set' (both can mean a collection. I am not sure about the 'in' bit.).
'over' says to put letters next to each other (in a down clue, some letters go over others).
'head' becomes 'top' (synonyms).
'relinquishing' is a deletion indicator.
'power' becomes 'p' (symbol in physics).
'top' with 'p' removed is 'to'.
Can you help me to learn more?
(Other definitions for set to that I've seen before include "Ding-dong" , "began working" , "Begin" , "Spat" , "closed" .)