Spoil mother with a little bit of luxury! (3)
I believe the answer is:
mar
'spoil' is the definition.
(synonyms)
'mother with a little bit of luxury' is the wordplay.
'mother' becomes 'ma' (ma can mean mother).
'with' is a charade indicator (letters next to each other).
'a little bit of luxury' becomes 'r' (I am not sure about this - if you are sure you should believe this answer much more).
'ma'+'r'='MAR'
Can you help me to learn more?
(Other definitions for mar that I've seen before include "Spoil stuff" , "Ram into and spoil" , "when spring growth starts?" , "wreck" , "Blemish" .)