Just hug flirt nervously (8)
I believe the answer is:
rightful
'just' is the definition.
('rightful' can be similar in meaning to 'just')
'hug flirt nervously' is the wordplay.
'nervously' indicates anagramming the letters.
'hug'+'flirt'='hugflirt'
'hugflirt' is an anagram of 'RIGHTFUL'.
(Other definitions for rightful that I've seen before include "Legitimate, fitting" , "Proper - legitimate" , "Legitimately claimed" , "Legitimate - deserved" , "Legally valid" .)