Rise in court: make legal claim about case of racketeering (7)
I believe the answer is:
upsurge
'rise' is the definition.
(I've seen this in another clue)
'in court make legal claim about case of racketeering' is the wordplay.
'in court' becomes 'up' (up before a judge).
'make legal claim' becomes 'sue' (as in suing someone in court).
'about' is an insertion indicator.
'case of' says to hollow out the word (remove centre letters) (like emptying a case).
'racketeering' with its middle taken out is 'rg'.
'sue' going around 'rg' is 'surge'.
'up'+'surge'='UPSURGE'
(Other definitions for upsurge that I've seen before include "growth" , "Sudden or abrupt strong increase" , "A sudden rise, as in business" , "Rapid rise" , "Sudden large increase" .)