Take That, not half furtive! (7)
I believe the answer is:
stealth
'take that not half furtive' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'take that not half' is the wordplay.
'take' becomes 'steal' (stealing is a kind of taking).
'not half' suggests halving the letters.
'that' cut in half is 'th'.
'steal'+'th'='STEALTH'
Can you help me to learn more?
(Other definitions for stealth that I've seen before include "Halt set in furtive manner" , "Avoiding detection by moving carefully" , "Cautious and surreptitious action or movement" , "Avoidance of detection by moving carefully" , "underhand dealing" .)