Tire (4)
I believe the answer is:
flag
'tire' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for flag that I've seen before include "Emblematic rectangular piece of fabric" , "what Amundsen planted" , "Droop with tiredness" , "part of pavement" , "Rectangular piece of fabric used as a signalling device" .)