So I enter the new names with gusto (10)
I believe the answer is:
enthusiasm
'gusto' is the definition.
(thesaurus)
'so i enter the new names' is the wordplay.
'so' becomes 'thus' ('thus' can be a synonym of 'so'**).
'enter' means one lot of letters goes inside another.
'the new' indicates anagramming the letters.
'thus'+'i'='thusi'
'names' with letters rearranged gives 'enasm'.
'thusi' going into 'enasm' is 'ENTHUSIASM'.
'with' is the link.
(Other definitions for enthusiasm that I've seen before include "Avidity" , "spirit?" , "Ardour" , "Intense and lively interest" , "Zeal" .)