Silsilah as-Sahihah 739 — How men and women reply to permission

It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him), he says that the Messenger of Allah (peace and blessings of Allah be upon him) said: "When a man is praying and permission is sought from him, he should grant permission by saying «سبحان الله», and when a woman is praying and permission is sought from her, she should grant permission by clapping."