New guy, Leo, making speech of commendation (6)
I believe the answer is:
eulogy
'speech of commendation' is the definition.
'eulogy' can be an answer for 'commendation' (eulogy is a kind of commendation). I'm not sure about the 'speech of' bit.
'new guy leo' is the wordplay.
'new' indicates anagramming the letters.
'guy'+'leo'='guyleo'
'guyleo' is an anagram of 'EULOGY'.
'making' acts as a link.
Can you help me to learn more?
(Other definitions for eulogy that I've seen before include "Formally expressed praise" , "Expression of high praise" , "Expression of praise for someone recently dead" , "Funeral speech" , "Funeral tribute" .)