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Overshoot
M1
service
station’s
entrances
(4)
Overshoot M1 service station’s entrances (4)
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The definition is at the beginning of the clue.
How the clue works
Overshoot means to MISS, as in failing to hit a target. The wordplay takes M1 (the motorway, giving MI with the 1 as Roman numeral I) plus the entrances (first letters) of "service station's" which give S and S, forming MI+SS.