Heads of lodge in extremely distinctive clothing (6)
I believe the answer is:
livery
'distinctive clothing' is the definition.
(livery is a type of uniform)
'heads of lodge in extremely' is the wordplay.
'heads of' suggests taking the first letters.
'extremely' becomes 'very' (very can mean extremely or considerably).
The initial letters of 'lodge in' is 'li'.
'li'+'very'='LIVERY'
(Other definitions for livery that I've seen before include "Distinctive uniform once worn by servants of posh people" , "Horse maintenance" , "Feeding and stabling of horses for money" , "group of servants" , "Uniform, eg of guild" .)