Possible Clues:

• Not plain why he should get the artist back
• Not easy to grasp, like some physics with a bit of a twist
• In some obscure way your relative got the artist up (7)
• Relative with a piece of youngster's education that's in need of explanation
• Confused relative's a Republican
• It's not easy to understand how the artist turns up, following hid old relative
• Not certain if Sam has gone to Arabia
• Cloudy or opaque
• Not definite
• Obscure pawnbroker turned painter