Valve gets most of the rubbish let out (8)
I believe the answer is:
throttle
'valve' is the definition.
(throttle is a kind of valve)
'most of the rubbish let out' is the wordplay.
'most of' means to remove the last letter.
'rubbish' becomes 'rot' (I've seen this before).
'out' is an anagram indicator (out can mean wrong or inaccurate).
'the' with its last letter removed is 'th'.
'let' with letters rearranged gives 'tle'.
'th'+'rot'+'tle'='THROTTLE'
'gets' acts as a link.
(Other definitions for throttle that I've seen before include "Accelerator - choke" , "Strangle; regulator valve" , "Choke, strangle" , "what regulates flow of juice?" , "Strangle with car part" .)