Reportedly took off chimney (4)
I believe the answer is:
flue
'chimney' is the definition.
(I've seen this before)
'reportedly took off' is the wordplay.
'reportedly' indicates a 'sounds like' (homophone) clue.
'took off' becomes 'flew' (I've seen this in another clue).
'flew' is a homophone of 'FLUE'.
(Other definitions for flue that I've seen before include "Small chimney" , "Smoke duct" , "Duct for smoke/gases" , "Chimney pipe to draw off smoke" , "Chimney-shaft" .)