Get wheels in middle for train (7)
I believe the answer is:
cortege
'train' is the definition.
(I've seen this before)
'get wheels in middle' is the wordplay.
'wheels' says the letters should be written in reverse (to wheel can mean to turn around).
'in' indicates putting letters inside.
'middle' becomes 'core'.
'get' in reverse letter order is 'teg'.
'teg' placed into 'core' is 'CORTEGE'.
'for' acts as a link.
(Other definitions for cortege that I've seen before include "train" , "Processing figures" , "Solemn funeral procession" , "Entourage, retinue" .)