Some hot concoction to start with that's tasty (9)

'that's tasty' is the definition.
(toothsome can mean tasty or delicious)
'some hot concoction to start' is the wordplay.
'concoction' indicates anagramming the letters.
'start' is a charade indicator (letters next to each other).
'some'+'hot'='somehot'
'somehot' is an anagram of 'othsome'.
'othsome' after 'to' is 'TOOTHSOME'.
'with' acts as a link.
(Other definitions for toothsome that I've seen before include "It's just like a T-Rex" , "Inviting" , "attractive" , "Pleasing" , "Temptingly tasty" .)
'tasty' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'some hot concoction to start with' is the wordplay.
'some' indicates the central letters.
'hot' becomes 'hip' (both can mean fashionable or trendy).
'concoction' becomes 'st' (I can't explain this - if you can you should believe this answer much more).
'to start with' says to put letters next to each other.
The middle letter of 'hip' is 'i'.
'i' put after 'st' is 'STI'.
'that's' is the link.
Can you help me to learn more?
