Wayward navvies, individual acknowledged, are neglectful of others' privacy (8)
I believe the answer is:
invasive
'acknowledged are neglectful of others' privacy' is the definition.
I can't judge whether this defines the answer.
'wayward navvies individual' is the wordplay.
'wayward' is an anagram indicator (wayward means out of control or chaotic).
'individual' becomes 'i' (Roman numeral for one).
'navvies'+'i'='navviesi'
'navviesi' is an anagram of 'INVASIVE'.
Can you help me to learn more?
(Other definitions for invasive that I've seen before include "Obtrusive, incursive" , "Encroaching" , "Tending to spread, like plants or disease" , "Intruding" , "Tending to intrude" .)