Same trouble with underground (5)
I believe the answer is:
Here is my best explanation:
'underground' is the definition.
('metro' can be a synonym of 'underground')
'same trouble with' is the subsidiary indication.
'with' indicates the answer is hidden within the clue.
'metro' can be found hidden inside 'same trouble'.
(Other definitions for metro that I've seen before include "Underground rail system", "Underground railway", "Parisian underground railway", "Parisian rail system", "The underground railway system in Paris", "The Paris Underground transport system", "Parisian underground system", "Paris underground rail system", "Urban railway system" and "Paris subway".)