Ring road beyond centre of Tangiers (4)
I believe the answer is:
gird
'ring' is the definition.
(I know that gird is a type of ring)
'road beyond centre of tangiers' is the wordplay.
'road' becomes 'rd' (abbreviation).
'beyond' means one lot of letters go next to another.
'centre of' indicates the central letters.
The middle letters of 'tangiers' are 'gi'.
'rd' after 'gi' is 'GIRD'.
(Other definitions for gird that I've seen before include "Encircle - fasten with belt" , "Surround" , "ring" , "Put a belt on" , "Steel" .)