Beef you can buy for about a pound a pound? (5)
I believe the answer is:
bully
'beef' is the definition.
(bully beef is corned beef)
'for about a pound a pound?' is the wordplay.
'for' becomes 'buy' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'about' indicates putting letters inside.
'a pound' becomes 'L' (abbreviation e.g. Lsd - pounds, shillings, pence).
'a pound?' becomes 'L' (abbreviation e.g. Lsd - pounds, shillings, pence).
'l'+'l'='ll'
'buy' enclosing 'll' is 'BULLY'.
'you can buy' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for bully that I've seen before include "Intimidating person" , "excellent" , "Beef cured or pickled in brine" , "Well done" , "Playground thug" .)