Row about head of ginger cat (5)
I believe the answer is:
tiger
'cat' is the definition.
(tiger is a kind of cat)
'row about head of ginger' is the wordplay.
'row' becomes 'tier' (a tier is a row of things).
'about' is an insertion indicator.
'head of' says to take the initial letters.
The first letter of 'ginger' is 'g'.
'tier' enclosing 'g' is 'TIGER'.
(Other definitions for tiger that I've seen before include "___ Woods, golfer" , "Striped carnivore" , "''... ... burning bright, in the forests of the night'' (Blake)" , "Beast - type of 1 across" , "Predator" .)