Diverted metro runs in quake ... (6)
I believe the answer is:
tremor
'quake' is the definition.
(I know that tremor is a type of quake)
'diverted metro runs in' is the wordplay.
'diverted' indicates an anagram (letters must be diverted to different positions).
'runs' becomes 'r' (cricket abbreviation).
'in' is an insertion indicator.
'metro' anagrammed gives 'temor'.
'temor' placed around 'r' is 'TREMOR'.
(Other definitions for tremor that I've seen before include "A slight shake, perhaps of earth" , "Vibration from earthquake" , "Strong shake" , "Quavering" , "Shudder - quake" .)