Got weird disease on holiday there (7)

I believe the answer is:

seaside

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'holiday there' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'got weird disease' is the wordplay.
'disease' anagrams to 'SEASIDE'.
Though, I am unsure how this is indicated.

'on' acts as a link.

Can you help me to learn more?

(Other definitions for seaside that I've seen before include "Beach location" , "Shoreline" , "holiday venue" , "Ocean shore" , "Holiday destination" .)

I've seen this clue in The Irish Times.

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