English writer’s trunk initially received in English school (10)
I believe the answer is:
chesterton
'english writer's' is the definition.
(I've seen this before)
'trunk initially received in english school' is the wordplay.
'trunk' becomes 'chest' (I've seen this before).
'initially' says to take the initial letters.
'in' means one lot of letters goes inside another.
'english school' becomes 'eton' (I've seen this in another clue).
The initial letter of 'received' is 'r'.
'r' inserted into 'eton' is 'erton'.
'chest'+'erton'='CHESTERTON'
(Other definitions for chesterton that I've seen before include "English writer" , "Writer, creator of Father Brown" , "Writer born in London" , "G K - -" , "London-born writer" .)