Caledonian come down and return cart to police headquarters? (8,4)
I believe the answer is:
scotland yard
'police headquarters?' is the definition.
'Scotland Yard' can be an answer for 'police' (thesaurus). I am not certain of the 'headquarters?' bit.
'caledonian come down and return cart' is the wordplay.
'caledonian' becomes 'scot' (I've seen this before).
'come down' becomes 'land' (to land is to come down after flying).
'and' is a charade indicator (letters next to each other).
'return' is a reversal indicator.
'cart' becomes 'dray' (a cart without sides for delivering heavy loads).
'dray' written backwards gives 'yard'.
'scot'+'land'+'yard'='SCOTLAND YARD'
'to' is the link.
Can you help me to learn more?
(Other definitions for scotland yard that I've seen before include "London force HQ" , "(New) office for the Met" , "Detective department of the Metropolitan Police" , "London CID" , "Metropolitan Police HQ" .)