Menu needs rump put into cooker (6)
I believe the answer is:
agenda
'menu' is the definition.
(I've seen this before)
'rump put into cooker' is the wordplay.
'rump' becomes 'end' (I've seen this in another clue).
'put into' means one lot of letters goes inside another.
'cooker' becomes 'aga' (I've seen this before).
'end' going within 'aga' is 'AGENDA'.
'needs' is the link.
(Other definitions for agenda that I've seen before include "List of items for discussion at a meeting" , "List of items of business for committee" , "Topic list for meeting" , "List of items for discussion by committee" , "Schedule - things to be done" .)