VIP with outsize head cover (6)
I believe the answer is:
bigwig
'vip' is the definition.
(I've seen this before)
'with outsize head cover' is the wordplay.
'with' is a charade indicator (letters next to each other).
'outsize' becomes 'big' (similar in meaning).
'head cover' becomes 'wig' (wig is a kind of cover. I am not sure about the 'head' bit.).
'big' next to 'wig' is 'BIGWIG'.
Can you help me to learn more?
(Other definitions for bigwig that I've seen before include "Important person with large toupee" , "important figure" , "Mogul" , "Person of some importance" , "'Chief, top banana (6)'" .)