Block remote order for a gauge (9)
I believe the answer is:
barometer
'gauge' is the definition.
(I know that barometer is a type of gauge)
'block remote order' is the wordplay.
'block' becomes 'bar' (block can mean to ban or bar).
'order' indicates anagramming the letters.
'remote' is an anagram of 'ometer'.
'bar'+'ometer'='BAROMETER'
'for a' acts as a link.
(Other definitions for barometer that I've seen before include "Instrument to measure atmospheric pressure" , "It measures air pressure" , "Pressure gauge" , "Weather forecaster" , "It checks state of sky" .)