Best boy raised in warehouse (5)
I believe the answer is:
depot
'warehouse' is the definition.
(I've seen this in another clue)
'best boy raised' is the wordplay.
'best' becomes 'top' (top can mean the very best).
'boy' becomes 'ed' (short for Edward).
'raised' says the letters should be written in reverse (going up in a down clue).
'top'+'ed'='toped'
'toped' back-to-front is 'DEPOT'.
'in' is the link.
(Other definitions for depot that I've seen before include "bus terminus" , "Storehouse or warehouse" , "Place where buses and trains are kept" , "Storehouse or main bus station (5)" , "Large storage site" .)