I’m grateful for opening tin bound to contain superior fruit (10)
I believe the answer is:
cantaloupe
'fruit' is the definition.
(I know that cantaloupe is a fruit)
'i'm grateful for opening tin bound to' is the wordplay.
'i'm grateful' becomes 'ta' (both can mean thank you).
'for opening' means one lot of letters goes inside another (some letters open a gap in others).
'tin' becomes 'can' (synonyms).
'bound to' becomes 'loupe' (I can't explain this - if you can you should give a lot more credence to this answer).
'can'+'loupe'='canloupe'
'ta' going inside 'canloupe' is 'CANTALOUPE'.
'contain superior' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for cantaloupe that I've seen before include "Small melon with ribbed skin" , "Musk-melon" , "fruit" , "Small melon variety" , "Small to medium-sized melon with yellowish flesh" .)