Prompt, say, getting grand playing (3,2)
I believe the answer is:
egg on
'prompt' is the definition.
(thesaurus)
'say getting grand playing' is the wordplay.
'say' becomes 'eg'.
'getting' says to put letters next to each other.
'grand' becomes 'g' ('G' can be a synonym of 'grand').
'playing' becomes 'on'.
'eg'+'g'+'on'='EGG ON'
(Other definitions for egg on that I've seen before include "Prompt" , "Urge, impel" , "'Incite, urge (3,2)'" , "Encourage to act" , "Urge (someone) to take risks" .)