Proposal put in limp language (4)
I believe the answer is:
plan
'proposal' is the definition.
(a proposal is a plan of action)
'in limp language' is the wordplay.
'in' indicates the answer is hidden within the clue.
'PLAN' is hidden in the letters of 'limp language'.
'put' acts as a link.
(Other definitions for plan that I've seen before include "Contrive" , "Agenda" , "Large-scale map" , "Layout drawing" , "Map; intention" .)