Island accordingly accommodates motorway in narrow strip of land (7)
I believe the answer is:
isthmus
'narrow strip of land' is the definition.
(I've seen this before)
'island accordingly accommodates motorway' is the wordplay.
'island' becomes 'is' (abbreviation).
'accordingly' becomes 'thus' (both can mean consequently or therefore).
'accommodates' is an insertion indicator.
'motorway' becomes 'M' (as in motorway names - M1, M4 etc).
'thus' going around 'm' is 'thmus'.
'is'+'thmus'='ISTHMUS'
'in' is the link.
(Other definitions for isthmus that I've seen before include "Such a narrow area" , "Connective strip of land" , "Narrow strip of land between two larger ones" , "Narrow strip of land connecting two large masses" , "Narrow linking piece of land" .)