Endlessly tries but fails to get praise (7)
I believe the answer is:
tribute
'praise' is the definition.
(thesaurus)
'endlessly tries but fails' is the wordplay.
'endlessly' means to remove the last letter.
'fails' is an anagram indicator (a failed spelling).
'tries' with its last letter taken off is 'trie'.
'trie'+'but'='triebut'
'triebut' with letters rearranged gives 'TRIBUTE'.
'to get' acts as a link.
(Other definitions for tribute that I've seen before include "Expression of praise" , "Compliment" , "Commendation; homage" , "Statement of gratitude and acknowledgment" , "Gesture showing respect or admiration" .)