Related stronghold blitzed sample in advance (9)

I believe the answer is:

foretaste

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'sample in advance' is the definition.
'foretaste' can be an answer for 'sample' (I've seen this before). I am not sure about the 'in advance' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for foretaste that I've seen before include "Brief experience of what is to come" , "a sample of goodies to come?" , "Appetiser" , "Sample of what's ahead" , "Anticipatory experience" .)

I've seen this clue in the Sydney Morning Herald.

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