Bully using web the wrong way to nurse broken heart (8)
I believe the answer is:
threaten
'bully' is the definition.
(thesaurus)
'web the wrong way to nurse broken heart' is the wordplay.
'web' becomes 'net' ('net' can be a synonym of 'web').
'the wrong way' says the letters should be written backwards.
'to nurse' indicates putting letters inside.
'broken' indicates an anagram.
'net' written backwards gives 'ten'.
'heart' is an anagram of 'hreat'.
'ten' enclosing 'hreat' is 'THREATEN'.
'using' acts as a link.
(Other definitions for threaten that I've seen before include "'Menace, intimidate (8)'" , "Menace, warn of intention to harm" , "Utter menaces" , "Menace - impend" , "Bully" .)