What stops metro train going off the rails? (10)
I believe the answer is:
terminator
'what stops' is the definition.
I can't tell whether this definition defines the answer.
'metro train going off the rails?' is the wordplay.
'going off the rails?' is an anagram indicator (the order of letters is out of control).
'metro'+'train'='metrotrain'
'metrotrain' anagrammed gives 'TERMINATOR'.
Can you help me to learn more?
(Another definition for terminator that I've seen is " satellite line".)
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