Was brilliant that pig finally farrowed (9)

I believe the answer is:

glittered

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'was brilliant' is the definition.
(I've seen this before)

'pig finally farrowed' is the wordplay.
'finally' suggests the final letters.
'farrowed' becomes 'littered' (I can't justify this - if you can you should believe this answer much more).
The final letter of 'pig' is 'g'.
'g'+'littered'='GLITTERED'

'that' is the link.

Can you help me to learn more?

(Other definitions for glittered that I've seen before include "Was like a star" , "Was brilliant" , "Sparkled" .)

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

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