Support limiting jump in business discussions (4,4)
I believe the answer is:
shop talk
'business discussions' is the definition.
'support limiting jump' is the wordplay.
'support' becomes 'stalk' (supportive part of a plant**).
'limiting' is an insertion indicator.
'jump' becomes 'hop' (hop is a kind of jump).
'stalk' enclosing 'hop' is 'SHOP TALK'.
'in' is the link.
(Other definitions for shop talk that I've seen before include "chat about job to be done?" , "Chat about business especially out of hours" , "business jargon" , "business, as discussed elsewhere" , "after-hours conversation?" .)