Leading suspect got involved in a row? (7)
I believe the answer is:
aligned
'got involved in a row?' is the definition.
'leading suspect' is the wordplay.
'suspect' indicates an anagram.
'leading' with letters rearranged gives 'ALIGNED'.
(Other definitions for aligned that I've seen before include "Put straight" , "Linearly positioned" , "joined forces" , "Brought into the correct relationship (with)" , "made to toe the line" .)