Definitions of practising certificate
a certificate from the UK Law Society (=a UK professional organisation responsible for the training and professional standards of solicitors in England and Wales) that shows that someone can work as a solicitor (=a type of UK lawyer)
Ms Carmichael's practising certificate has been suspended and the Law Society has taken control of her practice.
a licence to practise a specific profession
A practising certificate (PC) is required when a member engages in practice.