Shows sense essentially, after receiving final letters, perhaps, and mellows? (6)
I believe the answer is:
ripens
'mellows?' is the definition.
(I've seen this in another clue)
'shows sense essentially after receiving final letters perhaps' is the wordplay.
I cannot quite see how this works, but
'letters' could be 'ens' (I've seen this in another clue) and 'ens' is found in the answer.
The remaining letters 'rip' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'and' is the link.
Can you help me to learn more?
(Another definition for ripens that I've seen is " Matures".)