Many a rascal shows which way the wind blows (6)
I believe the answer is:
drogue
'which way the wind blows' is the definition.
I can't judge whether this defines the answer.
'many a rascal' is the wordplay.
'many' becomes 'D' (Roman numeral for 500).
'a rascal' becomes 'rogue' (both can mean a scoundrel).
'd'+'rogue'='DROGUE'
'shows' is the link.
Can you help me to learn more?
(Other definitions for drogue that I've seen before include "Type of parachute" , "Kind of parachute" , "Stabilising parachute" .)