Mayall's daddy coming round for spice (7)
I believe the answer is:
paprika
'for spice' is the definition.
(I've seen this before)
'mayall's daddy coming round' is the wordplay.
'mayall' becomes 'rik' (I am not sure about this - if you are sure you should believe this answer much more).
'daddy' becomes 'papa' (synonyms).
'coming round' means one lot of letters goes inside another.
'rik' placed into 'papa' is 'PAPRIKA'.
Can you help me to learn more?
(Other definitions for paprika that I've seen before include "Hot powder" , "strong-tasting spice" , "Irk papa with mild red pepper" , "Orange-red spice" , "Deep red spice" .)