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4d as a result of a dot above an umlaut ?R?O I have orso but also saw ergo?
13a/23d From the mean streets of New York it was De Niro's titular role to stardom. 4, 6. ?A?I D?I???
16d is just the letterP_____________________g. 10 letters no clue I have
P?O?C?G???
7d gotta be an institution for those seeking extra terrestial intelligence 4 ?E?I

Taxi driver

Thanks appreciate your help

4d: ergo (a dot above an umlaut is the sign for therefore)

7d SETI

S(earch) E(xtra) T(errestial) I(ntelligence)

7d: CETI
Communication with extra terrestrial intelligence

Prolonging - your 'C' should be 'o' as in Ad Hoc