Worried about husband blocking an expressway (8)
I believe the answer is:
autobahn
'expressway' is the definition.
(autobahn is a kind of expressway)
'worried about husband blocking an' is the wordplay.
'worried' indicates anagramming the letters.
'husband' becomes 'h' (**).
'blocking' means one lot of letters goes inside another.
'about' anagrammed gives 'utoba'.
'utoba'+'h'='utobah'
'utobah' inserted within 'an' is 'AUTOBAHN'.
(Other definitions for autobahn that I've seen before include "Great way" , "German lanes" , "Motorway in Germany" , "German or Austrian motorway" , "It takes continental drivers" .)