Close up Oscar sees audience's dirty (7)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

O(letter represented by “Oscar” in the phonetic alphabet) + { twice the homophone of ( … audience’s ) “ see “, OR, if you like, twice the acronym for “see” in text messaging, as in “c u” } + homophone of ( audience’s ) “lewd”(dirty/obscene).