Lays about a royal's garments (7)
I believe the answer is:
sarongs
'garments' is the definition.
(sarong is a kind of garment)
'lays about a royal's' is the wordplay.
'lays' becomes 'songs' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'about' is an insertion indicator.
'royal' becomes 'r' (abbreviation).
'a'+'r'='ar'
'songs' enclosing 'ar' is 'SARONGS'.
Can you help me to learn more?
(Other definitions for sarongs that I've seen before include "garments" , "Beach wraps" .)