Rushing with Briton to locomotive (6,8)
I believe the answer is:
flying scotsman
'locomotive' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'rushing with briton' is the wordplay.
'rushing with' becomes 'flying' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'briton' becomes 'scotsman' (I've seen this before).
'flying'+'scotsman'='FLYING SCOTSMAN'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for flying scotsman that I've seen before include "Glaswegian pilot?" , "Mac as pilot?" , "Express" , "Famous train once from King's Cross" , "High speed steam engine (1923)" .)