noun
old hand (at sth / at doing sth) a person with a lot of experience and skill in a particular activity :
She's an old hand at dealing with the press.
noun
old hand (at sth / at doing sth) a person with a lot of experience and skill in a particular activity :
She's an old hand at dealing with the press.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005