As 'master', receive too much (3,4)
I believe the answer is:
get over
'as master' is the definition.
'get over' can be an answer for 'master' (synonyms). I am not certain of the 'as' bit.
'receive too much' is the wordplay.
'receive' becomes 'get' (synonyms).
'too much' becomes 'over' (over can mean to too great an extent).
'get'+'over'='GET OVER'
Can you help me to learn more?
(Other definitions for get over that I've seen before include "Deal with successfully, improve in health" , "Clear" , "master?" , "Recover" .)