Crossword Genius

Clean motorway entrance (5)

Ross

I believe the answer is:

charm

'entrance' is the definition.
(synonyms)

'clean motorway' is the wordplay.
'clean' becomes 'char' (char can mean a cleaner).
'motorway' becomes 'M' (as in motorway names - M1, M4 etc).
'char'+'m'='CHARM'

(Other definitions for charm that I've seen before include "Allure" , "Win over" , "Bracelet ornament" , "Greatly delight" , "Enrapture" .)

I've seen this clue in The Times.
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