Uniform from start of last year I've right to wear (6)
I believe the answer is:
livery
'uniform' is the definition.
(livery is a type of formal uniform)
'start of last year i've right to wear' is the wordplay.
'start of' suggests taking the first letters.
'right' becomes 'r' (common abbreviation).
'to wear' is an insertion indicator (to wear something is to be covered up by it).
The initial letters of 'last year' is 'ly'.
'ive'+'r'='iver'
'ly' placed around 'iver' is 'LIVERY'.
'from' is the link.
(Other definitions for livery that I've seen before include "The stabling and care of horses" , "Uniform worn by male servants" , "The care of horses for pay" , "Fancy dress for footmen" , "Uniform, eg of guild" .)