Strongly attack greeting by solicitor (3,3)
I believe the answer is:
hit out
'strongly attack' is the definition.
'greeting by solicitor' is the wordplay.
'greeting' becomes 'hi' (hi is a kind of greeting).
'by' is a charade indicator (letters next to each other).
'solicitor' becomes 'tout' (I've seen this before).
'hi'+'tout'='HIT OUT'
(Other definitions for hit out that I've seen before include "Throw a punch" , "Launch a verbal attack" , "Make a strong attack" , "Be severely critical of" , "Attack verbally" .)