Lack of concern shown briefly by Vicky and Priscilla (15)

'priscilla' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's an association between them I don't understand?

'lack of concern shown briefly by vicky and' is the wordplay.
I cannot quite understand how this works, but
'of' could be 'o' and 'o' is present in the answer.
'concern' could be 'ld' (Ld. is an example) and 'ld' is present in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?