Expression of esteem (7)
'expression of esteem' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for tribute that I've seen before include "Words expressing approbation" , "Words or gift conveying respect and admiration" , "Payment from dependent state (historical)" , "Expression of praise" , "Statement of admiration" .)
(Other definitions for testimonial that I've seen before include "special match" , "Character reference" , "Tribute or token of respect" , "Commendation" , "Public tribute (to someone)" .)