Train shortened trip in anger (9)
I believe the answer is:
entourage
'train' is the definition.
(a train of people)
'shortened trip in anger' is the wordplay.
'shortened' means to remove the last letter.
'trip' becomes 'tour' (a journey or expedition).
'in' means one lot of letters goes inside another.
'anger' becomes 'enrage' (to enrage is to anger).
'tour' with its final letter removed is 'tou'.
'tou' going inside 'enrage' is 'ENTOURAGE'.
(Other definitions for entourage that I've seen before include "Staff" , "Ego nature found in accompanying group" , "Retinue, cortege" , "Following" , "Group of attendants" .)