On and on and on, railing at international banishment (10)
I believe the answer is:
relegation
'banishment' is the definition.
(relegation is a kind of banishment)
'on and on and on railing at international' is the wordplay.
'on' becomes 're' ('on' can be mean 'with reference to').
'and' means one lot of letters go next to another.
'and' says to put letters next to each other.
'on railing' becomes 'leg' (I am not sure about this - if you are sure you should believe this answer much more).
'international' becomes 'i' (abbreviation eg in IMF).
'leg'+'at'+'i'='legati'
'on' after 'legati' is 'legation'.
're' next to 'legation' is 'RELEGATION'.
Can you help me to learn more?
(Other definitions for relegation that I've seen before include "Demotion, to a lower league" , "that's going down" , "Lowering of status" , "Transference to a lower league" .)