Wader's invoice for item of kitchen silver? (9)
I believe the answer is:
spoonbill
'wader's' is the definition.
(spoonbill is a kind of wader)
'invoice for item of kitchen silver?' is the wordplay.
'invoice' becomes 'bill' (synonyms).
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'item of kitchen silver?' becomes 'spoon' (cutlery item).
'bill' put after 'spoon' is 'SPOONBILL'.
(Other definitions for spoonbill that I've seen before include "Wading bird with broad beak" , "Wader" , "Large wading bird" , "Tall wading bird" , "one rarely seen in the UK?" .)