So I enter the new names with gusto (10)
I believe the answer is:
enthusiasm
'gusto' is the definition.
(I've seen this before)
'so i enter the new names' is the wordplay.
'so' becomes 'thus' (synonyms).
'enter' indicates putting letters inside.
'the new' indicates an anagram.
'thus'+'i'='thusi'
'names' is an anagram of 'enasm'.
'thusi' inserted into 'enasm' is 'ENTHUSIASM'.
'with' acts as a link.
(Other definitions for enthusiasm that I've seen before include "Avidity" , "spirit?" , "Ardour" , "Intense and lively interest" , "Zeal" .)