Dervishes were the dhulbahante anti-imperialists of the Dhulbahante state (circa 1895 - 1921) founded in Dareema caddo (or their modern Dhulbahante descendants), led by Sayyidka and xarunta; successor state of the dhulbahante garadship
to be dervishized means you are well-acquainted with SSC-Khatumo customs and traditions, such as the Garad & Harti culture, the horse and fortifications of Dhulbahante garesas as an emblem etc.
to dervishize is to coalesce with the dhulbahante in one way or another, such as marriage, forming a party, aking to the former dhulbahante anti-imperial dervish state, successor state to the dhulbahante garadship