Like a big cat, one injured in row (7)
I believe the answer is:
leonine
'like a big cat' is the definition.
(leonine means like a lion)
'one injured in row' is the wordplay.
'injured' indicates an anagram.
'in' is an insertion indicator.
'row' becomes 'line' (as in a row of things).
'one' is an anagram of 'eon'.
'eon' inserted into 'line' is 'LEONINE'.
(Other definitions for leonine that I've seen before include "Like a beast with a mane, perhaps" , "Description of pride" , "Catty" , "As one with pride" , "Resembling a big cat" .)