Less gear change shows generosity (8)
I believe the answer is:
largesse
'generosity' is the definition.
(I know that largesse is a type of liberality)
'less gear change' is the wordplay.
'change' indicates an anagram.
'less'+'gear'='lessgear'
'lessgear' is an anagram of 'LARGESSE'.
'shows' is the link.
(Other definitions for largesse that I've seen before include "Generous offering" , "Liberal gift" , "Les rages at the distribution of gifts" , "Magnanimous bestowal of gifts" , "charity" .)