Doctor was madly grabbing royal undergarment (7)
I believe the answer is:
drawers
'undergarment' is the definition.
(drawers is a kind of undergarment)
'doctor was madly grabbing royal' is the wordplay.
'doctor' becomes 'dr' ('Dr' can be a synonym of 'doctor').
'was madly' becomes 'aws' (I can't explain this - if you can you should believe this answer much more).
'grabbing' indicates putting letters inside.
'royal' becomes 'er' (I've seen this in other clues).
'aws' going around 'er' is 'awers'.
'dr'+'awers'='DRAWERS'
Can you help me to learn more?
(Other definitions for drawers that I've seen before include "Panties" , "undergarment" , "Underwear (for artists?)" , "designers" , "Underpants or sketchers" .)