noun which may take the genitive case particle 'no'
family doctor; regular clinic; one's regular doctor
Refers to a doctor, dentist, or clinic that one regularly visits. Often used in phrases like かかりつけの医者 (family doctor) or かかりつけの病院 (regular hospital).
Please consult your family doctor.
He has a regular dentist.
From the verb 掛かる (to be involved with) in its continuative form 掛かり plus 付け (attached), literally meaning 'attached to' or 'regularly associated with'. The kana spelling is standard.