Centrally placed on the motorway to Land's End (3)
I believe the answer is:
mid
'centrally placed' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives sometimes mean the same thing.
'the motorway to land's end' is the wordplay.
'the motorway' becomes 'MI' (resembles M1, English motorway).
'to' means one lot of letters go next to another.
'end' says to take the final letters.
The final letter of 'land' is 'd'.
'mi'+'d'='MID'
'on' is the link.
Can you help me to learn more?
(Other definitions for mid that I've seen before include "Denote the centre point" , "Of the central part" , "Dim sort of prefix" , "Prefix meaning centre" .)