Broke finally, thrust out a removable cover (7)
I believe the answer is:
shutter
'a removable cover' is the definition.
(I've seen this before)
'broke finally thrust out' is the wordplay.
'finally' suggests the final letters.
'out' is an anagram indicator (out can mean wrong or inaccurate).
The final letter of 'broke' is 'e'.
'e'+'thrust'='ethrust'
'ethrust' with letters rearranged gives 'SHUTTER'.
(Other definitions for shutter that I've seen before include "Moveable window screen" , "camera component" , "Hinged window blind" , "Camera mechanism" , "Hinged window cover" .)