Expressions (phrases, clauses, etc.), Noun or verb acting prenominally
troublesome; difficult (e.g. customer, guest, child); laborious (e.g. task, dinner)
Idiomatic expressionsee 手が掛かる
彼って手の掛かる人だね。You really have to manage him carefully.
Also written 手の掛かる【てのかかる】