Without others coming over, a little trifle's enough (7)
I believe the answer is:
oneself
'without others' is the definition.
'coming over a little trifle's enough' is the wordplay.
'coming over' is a reversal indicator.
'a little' indicates a hidden word.
'fleseno' can be found hidden inside 'trifles enough'.
'fleseno' reversed gives 'ONESELF'.
(Other definitions for oneself that I've seen before include "personally" , "Personal pronoun" , "individual" , "Third person singular pronoun" , "By this, unaided" .)