Sign of joiner sprinkling Parmesan over top of dish (9)

I believe the answer is:

ampersand

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'sign of joiner sprinkling' is the definition.
'ampersand' can be an answer for 'sign' (ampersand is a kind of sign). I'm unsure of the 'of joiner sprinkling' bit.

'parmesan over top of dish' is the wordplay.
'over' is an anagram indicator.
'top of' suggests taking the first letters.
The first letter of 'dish' is 'd'.
'parmesan' with letters rearranged gives 'ampersan'.
'ampersan'+'d'='AMPERSAND'

Can you help me to learn more?

(Other definitions for ampersand that I've seen before include "Symbol for 'and'" , "character (sharing with 7)" , "Pens drama using &" , "It connects" , "that is seen at the keyboard" .)

I've seen this clue in The Telegraph.

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