Success in everything: has he had a wash and brush up? (5,5)
I believe the answer is:
clean sweep
'success in everything' is the definition.
(eg success in every competition)
'a wash and brush up?' is the wordplay.
'a wash' becomes 'clean' (I've seen this before).
'and' is a charade indicator (letters next to each other).
'brush up?' becomes 'sweep' (synonyms. I am not sure about the 'up?' bit.).
'clean'+'sweep'='CLEAN SWEEP'
'has he had' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for clean sweep that I've seen before include "Complete change; winning all the trophies" , "Complete achievement of objectives" , "That's when you get everything going" .)