Mature beef no good with side of nuggets (5)
I believe the answer is:
ripen
'mature beef no' is the definition.
'ripen' can be an answer for 'mature' (to ripen is to mature). I'm unsure of the 'beef no' bit.
'good with side of nuggets' is the wordplay.
'good' becomes 'ripe' (synonyms).
'with' is a charade indicator (letters next to each other).
'side of' says to take the initial letters (the letter from one side of the word).
The first letter of 'nuggets' is 'n'.
'ripe'+'n'='RIPEN'
Can you help me to learn more?
(Other definitions for ripen that I've seen before include "Become ready for harvesting" , "Get ready to eat" , "Mature, age" , "Get ready to open" , "Become ready for eating" .)