In bar, I'm with a female that's upset close friend (8)
I believe the answer is:
familiar
'close friend' is the definition.
(thesaurus)
'in bar i'm with a female that's upset' is the wordplay.
'in bar' becomes 'rail' (rail is a kind of bar. I am not sure about the 'in' bit.).
'with' is a charade indicator (letters next to each other).
'female' becomes 'f' (abbreviation).
'that's upset' shows that the letters should be reversed in order.
'rail'+'im'+'a'+'f'='railimaf'
'railimaf' backwards is 'FAMILIAR'.
Can you help me to learn more?
(Other definitions for familiar that I've seen before include "Witch's cat is well acquainted" , "Well-known, easily recognised" , "Conversant with the witch's cat?" , "Well-acquainted with a witch's cat" , "Intimate" .)