Perhaps Clementine, Charlotte and Lauryn will have to share a cell (9)

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

CHURCH (Charlotte Church – Welsh singer) and HILL (Lauryn Hill – American singer) sharing the last/first ‘h’ or ‘cell’ – Clementine was Winston Churchill’s wife – he was frequently seen wearing a 7/15