American generation's normal practice (5)
I believe the answer is:
usage
'normal practice' is the definition.
'usage' can be an answer for 'practice' (usage is a kind of practice). I am not sure about the 'normal' bit.
'american generation's' is the wordplay.
'american' becomes 'US' (United States).
'generation' becomes 'age' (as in age group).
'us'+'age'='USAGE'
Can you help me to learn more?
(Other definitions for usage that I've seen before include "phraseology" , "Way of treating" , "Custom - treatment" , "Way of employing" , "Common practice" .)