Keep under control with a fair amount of care heading for the sun with flying Scotsman (8)
I believe the answer is:
restrain
'keep under control' is the definition.
(I've seen this before)
'fair amount of care heading for the sun with flying scotsman' is the wordplay.
I cannot really understand how this works, but
'amount' could be 'rest' (rest is a kind of amount) and 'rest' is found within the answer.
'sun' could be 'ra' (ancient Egyptian sun god) and 'ra' is located in the answer.
The remaining letters 'in' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'with a' acts as a link.
Can you help me to learn more?
(Other definitions for restrain that I've seen before include "Keep under control" , "bar" , "Manacle" , "Limit" , "In arrest (anagram)" .)