also: わかいものがしら
noun
young wrestler trainer; sumo functionary
A sumo stable official responsible for training and organizing young wrestlers.
若者頭は若い力士の指導にあたる。
The young wrestler trainer is in charge of coaching the young sumo wrestlers.
Compound of 若者 (young person) and 頭 (head, leader). The reading わかものがしら is a standard compound reading; わかいものがしら uses the adjective 若い.