Fitzroy's terrified boxing seafood (6)

I believe the answer is:

oyster

'seafood' is the definition.
(oyster is a type of seafood)

'fitzroy's terrified boxing' is the wordplay.
'boxing' says the answer is hidden in the clue (the solution is contained or boxed up by the clue).
'OYSTER' can be found hidden inside 'fitzroys terrified'.

(Other definitions for oyster that I've seen before include "Succulent shellfish" , "rather grey" , "Greyish pink" , "Pearl-generating bivalve" , "Bivalve native" .)

I've seen this clue in The Irish Times.

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