Carrier of mine, from rubbish place, about twenty-five pounds (3,4)
I believe the answer is:
pit pony
'carrier of mine' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'rubbish place about twenty-five pounds' is the wordplay.
'rubbish place' becomes 'tip' (place for rubbish).
'about' says the letters should be written in reverse.
'twenty-five pounds' becomes 'pony' (UK slang for 25).
'tip' backwards is 'pit'.
'pit'+'pony'='PIT-PONY'
'from' acts as a link.
Can you help me to learn more?
(Other definitions for pit pony that I've seen before include "animal" , "underground worker" , "mineworker" .)