Take a long look at the flight report (5)
I believe the answer is:
stare
'take a long look' is the definition.
(I've seen this in another clue)
'the flight report' is the wordplay.
'the flight' becomes 'stair' (I've seen this before).
'report' shows a homophone (sound like) (as heard, or reported by someone).
'stair' is a homophone of 'STARE'.
'at' acts as a link.
(Other definitions for stare that I've seen before include "Look with fixed eyes" , "Gaze fixedly" , "'Look fixedly, without blinking (5)'" , "Long fixed look" , "Look hard" .)