Beijing-flavored erhua form of
角 (jué, 'role / character').
角 here is read jué (NOT jiǎo, which means 'horn / corner'). Strongly associated with traditional theater —
大角儿 'big star',
名角儿 'famous lead'. The 2017 film 《
老炮儿》 and Chen Kaige's 《
霸王别姬》 (Farewell My Concubine, 'Bàwáng Bié Jī') are full of this usage.