Barrow boys backed English horse (10)
I believe the answer is:
clydesdale
'horse' is the definition.
(Clydesdale is an example)
'barrow boys backed english' is the wordplay.
'barrow' becomes 'clyde' (I am not sure about this - if you are sure you should believe this answer much more).
'boys' becomes 'lads' (lad is a kind of boy).
'backed' is a reversal indicator.
'english' becomes 'E' (abbreviation).
'lads' reversed gives 'sdal'.
'clyde'+'sdal'+'e'='CLYDESDALE'
Can you help me to learn more?
(Other definitions for clydesdale that I've seen before include "Draught-horse" , "Powerful breed of horse" , "Breed of carthorse" , "Heavy breed of draft horse from Scotland" .)