Aggressive performer good in row (5)
I believe the answer is:
tiger
'aggressive performer' is the definition.
The definition and answer can be both people as well as being singular nouns.
I also know that 'aggressive' relates to this answer.
'good in row' is the wordplay.
'good' becomes 'g' (abbreviation).
'in' is an insertion indicator.
'row' becomes 'tier' (tier is a kind of row).
'g' inserted into 'tier' is 'TIGER'.
Can you help me to learn more?
(Other definitions for tiger that I've seen before include "Striped carnivore" , "Wildcat of Bengal" , "Ferocious cat" , "audacious person" , "Dynamic type - striped animal" .)