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Opposite motorway, under a Gormley (7)

Ross

I believe the answer is:

antonym

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'opposite' is the definition.
(synonyms)

'motorway under a gormley' is the wordplay.
'motorway' becomes 'm'.
'under' means one lot of letters go next to another.
'a gormley' becomes 'antony' (I can't explain this - if you can you should believe this answer much more).
'm' put after 'antony' is 'ANTONYM'.

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(Other definitions for antonym that I've seen before include "opposing description" , "A word opposite in meaning to another" , "One's import is contrary" , "Word that means the opposite of another" , "As 'happy' is to 'sad' or 'long' to 'short'" .)

I've seen this clue in The Everyman puzzle in The Observer.
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