### Clue: Publicity is all leading back to 1 across (9)
### Answer: PRISCILLA 
 ### Explanation: Definition: 1 across
 PR(abbrev. for "public relations";publicity) + IS + **reversal of**(… back) [ALL **+ **IC(abbrev. for "in charge";leading) ].  *Thanks to  for the latter part of the parsing, which I couldn't get.*
Defn: Cilla Black (1 across)'s forename in full.