Big and small uses found no end — that’s liberality! (8)
I believe the answer is:
largesse
'that's liberality' is the definition.
(thesaurus)
'big and small uses' is the wordplay.
'big' becomes 'large' (synonyms).
'and' says to put letters next to each other.
'small uses' becomes 'sse' (I can't justify this - if you can you should believe this answer much more).
'large'+'sse'='LARGESSE'
'found no end' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for largesse that I've seen before include "Generous disposal of gifts" , "Generosity in gift-giving" , "Les rages at the distribution of gifts" , "Generosity in bestowing gifts" , "Magnanimity, munificence" .)