Suggested cost of lean rump, finally, with side dish (4,5)
I believe the answer is:
list price
'suggested cost' is the definition.
'list price' can be an answer for 'cost' (list price is a kind of cost). I'm not sure about the 'suggested' bit.
'lean rump finally with side dish' is the wordplay.
'lean' becomes 'list' (both can mean to tilt).
'finally' says to take the final letters.
'with side dish' becomes 'rice' (I can't justify this - if you can you should believe this answer much more).
The last letter of 'rump' is 'p'.
'list'+'p'+'rice'='LIST-PRICE'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for list price that I've seen before include "RRP" , "What manufacturer says is the cost of an item" .)