Crossword Genius

Swineherd always seen in celebration (8)

Ross

I believe the answer is:

hogmanay

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'celebration?' is the definition.
(I've seen this before)

'swineherd always' is the wordplay.
'swineherd' becomes 'hogman' (I can't explain this - if you can you should believe this answer much more).
'always' becomes 'ay' (archaic term for 'always').
'hogman'+'ay'='HOGMANAY'

'seen in' acts as a link.

Can you help me to learn more?

(Other definitions for hogmanay that I've seen before include "Scottish New Year's Eve" , "Annual celebration" , "Festival" , "New Year up north" , "New Year's Eve (Scots)" .)

I've seen this clue in The Sun and The Telegraph.
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