Make a faulty announcement and fail to locate the art gallery (8)
I believe the answer is:
misstate
'make a faulty announcement and' is the definition.
I can't judge whether this definition defines the answer.
'fail to locate the art gallery' is the wordplay.
'fail to locate' becomes 'miss' (I've seen this before).
'the art gallery' becomes 'tate' (Tate Modern, Tate Britain etc).
'miss'+'tate'='MISSTATE'
Can you help me to learn more?
(Other definitions for misstate that I've seen before include "Put incorrectly" , "Declare wrongly" , "Mast site (anag.)" , "Inaccurately report" , "Give inaccurate info" .)