Info on American group of species (5)
I believe the answer is:
genus
'group of species' is the definition.
(I've seen this before)
'info on american' is the wordplay.
'info' becomes 'gen' (informal term for information).
'on' is a charade indicator (letters next to each other).
'american' becomes 'us' (abbreviation for United States).
'gen'+'us'='GENUS'
(Other definitions for genus that I've seen before include "Kind or sort of" , "Category above species (Biology)" , "Division of family" , "Taxonomic class between family and species" , "Biological group containing one or more species" .)