Ruined manoeuvre, having time to trespass (7)
I believe the answer is:
intrude
'to trespass' is the definition.
(synonyms)
'ruined manoeuvre having time' is the wordplay.
'manoeuvre' indicates anagramming the letters.
'having' is an insertion indicator.
'time' becomes 't' (abbreviation).
'ruined' with letters rearranged gives 'inrude'.
'inrude' placed around 't' is 'INTRUDE'.
(Other definitions for intrude that I've seen before include "Join in without being invited or wanted" , "meddle" , "Push in unwantedly" , "Come in when not wanted" , "Pry" .)