Crossword Genius

Seasonal entertainment used to be a sea voyage (7)

Ross

I believe the answer is:

wassail

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'seasonal entertainment' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'used to be a sea voyage' is the wordplay.
'used to be' becomes 'was' (eg 'he was...' means 'he used to be...').
'a sea voyage' becomes 'sail' (sail is a kind of voyage. I am not sure about the 'sea' bit.).
'was'+'sail'='WASSAIL'

Can you help me to learn more?

(Other definitions for wassail that I've seen before include "celebration" , "Go carol-singing" , "Carouse" , "festive drink" , "Sing Christmas carols" .)

I've seen this clue in The Independent.
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