Strong, but run over and broken (6)
I believe the answer is:
robust
'strong' is the definition.
('robust' can be similar in meaning to 'strong')
'run over and broken' is the wordplay.
'run' becomes 'r' (cricket abbreviation).
'over' becomes 'o' (cricket abbreviation).
'and' says to put letters next to each other.
'broken' becomes 'bust' (I've seen this before).
'r'+'o'+'bust'='ROBUST'
'but' acts as a link.
(Other definitions for robust that I've seen before include "of sturdy construction" , "Hardy and vigorous" , "Sturdy, resilient" , "Strong and healthy" , "Athletic" .)