Immediately performing after that trouble (2,3,4)
I believe the answer is:
on the nail
'immediately' is the definition.
(thesaurus)
'performing after that trouble' is the wordplay.
'performing' becomes 'on' (I've seen this in other clues).
'after' becomes 'then'.
'that trouble' becomes 'ail' (I've seen this before).
'on'+'then'+'ail'='ON THE NAIL'
(Other definitions for on the nail that I've seen before include "Exactly" , "Prompt" , "Exact" , "location of solution for digital protection" , "Where varnish is put" .)