Briton first using a plane and a locomotive (6,8)
I believe the answer is:
flying scotsman
'a locomotive' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'briton first using a plane' is the wordplay.
'briton' becomes 'scotsman' (I've seen this before).
'first' says to put letters next to each other.
'using a plane' becomes 'flying' (I can't explain this - if you can you should give a lot more credence to this answer).
'scotsman' after 'flying' is 'FLYING SCOTSMAN'.
'and' is the link.
Can you help me to learn more?
(Other definitions for flying scotsman that I've seen before include "Mac as pilot?" , "High speed steam engine (1923)" , "Famous train once from King's Cross" , "Express" , "Glaswegian pilot?" .)