Crossword Genius

Important person's large hairpiece (6)

Ross

I believe the answer is:

bigwig

'important person's' is the definition.
(bigwig is a kind of important person)

'large hairpiece' is the wordplay.
'large' becomes 'big' (synonyms).
'hairpiece' becomes 'wig' (wig is a kind of hairpiece).
'big'+'wig'='BIGWIG'

(Other definitions for bigwig that I've seen before include "Important person with large toupee" , "Personage" , "What may lie ahead largely" , "Dignitary (sl.)" , "Luminary" .)

I've seen this clue in The Telegraph.
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