Little brother notices Norfolk sailing area (6)
I believe the answer is:
broads
'norfolk sailing area' is the definition.
I can't judge whether this definition defines the answer.
'little brother notices' is the wordplay.
'little brother' becomes 'bro'.
'notices' becomes 'ads' (advertisements).
'bro'+'ads'='BROADS'
Can you help me to learn more?
(Other definitions for broads that I've seen before include "Old coins" , "Norfolk holiday area" , "Wetland" , "found in part of eastern England" .)