More tight with gratuities? That is right (7)
I believe the answer is:
tipsier
'more tight' is the definition.
('tipsy' can be a synonym of 'tight')
'with gratuities? that is right' is the wordplay.
'with' means one lot of letters go next to another.
'gratuities?' becomes 'tips' ('tip' can be a synonym of 'gratuity').
'that is' becomes 'ie' ('i.e.' can be a synonym of 'that is').
'right' becomes 'r' (common abbreviation).
'tips' put next to 'ie' is 'tipsie'.
'tipsie'+'r'='TIPSIER'
(Other definitions for tipsier that I've seen before include "Less sober" , "Happier" .)