Make famous Italian girl enter retro bar (3,2)
I believe the answer is:
big up
'make famous' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'italian girl enter retro bar' is the wordplay.
'italian' becomes 'I' (abbreviation for Italian).
'girl' becomes 'g'.
'enter' is an insertion indicator.
'retro' says the letters should be written in reverse (retro is Latin for 'backwards').
'bar' becomes 'pub' (I've seen this before).
'pub' reversed gives 'bup'.
'i'+'g'='ig'
'ig' going into 'bup' is 'BIG UP'.
Can you help me to learn more?
(Another definition for big up that I've seen is " Respect".)