Meat product not fresh? Not quite entirely (5)

I believe the answer is:

offal

I'm a little stuck... Click here to teach me more about this clue!

'meat product' is the definition.
(I've seen this before)

'not fresh? not quite entirely' is the wordplay.
'not fresh?' becomes 'off' (I can't justify this - if you can you should give a lot more credence to this answer).
'not quite' means to remove the last letter.
'entirely' becomes 'all' (I've seen this before).
'all' with its last letter taken off is 'al'.
'off'+'al'='OFFAL'

Can you help me to learn more?

(Other definitions for offal that I've seen before include "Internal organs of an animal used as food" , "Edible (or inedible!) animal organs" , "Liver, kidney, etc, as food" , "Meaty waste" , "Trimmings of a butchered animal" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.