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Train taking part of army unit up to the rear (7)
The answer is

R E T I N U E

but why?
It's a train.
It's to the rear.
U N I T is up.
but why 'taking part of army'?? etc etc
It all should be a neater fit!!

RE = Royal Engineers
TINU = unit up
E = rear of thE

Not the best clue ever.

RE (royal engineers)
tinu (unit up)
E (thE rear)

Thank you both.
That fits well