Sunan Abi Dawud, Book 3, Hadith 942 (USC-MSA) ⓘ
‘Isa b. Ayyub said: Clapping by women means that one should strike her left hand with the two fingers of her right hand.
حَدَّثَنَا مَحْمُودُ بْنُ خَالِدٍ، حَدَّثَنَا الْوَلِيدُ، عَنْ عِيسَى بْنِ أَيُّوبَ، قَالَ قَوْلُهُ " التَّصْفِيحُ لِلنِّسَاءِ " . تَضْرِبُ بِأُصْبُعَيْنِ مِنْ يَمِينِهَا عَلَى كَفِّهَا الْيُسْرَى .
also referenced under: Hadith 942 (DarusSalam) & Hadith 942 (Hasan)