Gain new skills concerning the Orient Express, say (7)
I believe the answer is:
retrain
'gain new skills' is the definition.
(I've seen this before)
'the orient express say' is the wordplay.
'the orient' becomes 're' (I can't explain this - if you can you should believe this answer much more).
'express say' becomes 'train' (express is a kind of train).
're'+'train'='RETRAIN'
'concerning' is the link.
Can you help me to learn more?
(Other definitions for retrain that I've seen before include "ready for a new assignment" , "Prepare for new job" , "Be taught new skills" , "Teach fresh skills" , "Teach skills for a new job" .)