Englishman abroad, one remains reduced to a pulp (6)
I believe the answer is:
pomace
'remains reduced to a pulp' is the definition.
'englishman abroad one' is the wordplay.
'englishman abroad' becomes 'pom' (Australian informal term).
'one' becomes 'ace' ('ace' can be a synonym of 'one').
'pom'+'ace'='POMACE'
(Other definitions for pomace that I've seen before include "Apple pulp" , "Marc, pulp" , "Crushed apples for making cider" , "Pulpy stuff" .)