A spice having no end of use in savouries (5)

I believe the answer is:

aspic

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'no end of use in savouries' is the definition.
I can't judge whether this defines the answer.

'a spice' is the wordplay.
'spice' becomes 'spic' (I can't justify this - if you can you should believe this answer much more).
'a'+'spic'='ASPIC'

'having' is the link.

Can you help me to learn more?

(Other definitions for aspic that I've seen before include "Lavender" , "Ending of Marlowe's thriller" , "Edible jelly" , "Preservative jelly" , "Jelly based on fish or meat stock" .)

I've seen this clue in The Globe and Mail.

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