Trespasser, gate-crasher (8)

I believe the answer is:

intruder

This clue is a double definition.

'trespasser' is the first definition.
(synonyms)

'gate-crasher' is the second definition.
(I've seen this before)

(Other definitions for intruder that I've seen before include "One entering unasked" , "Butter in" , "Unwelcome sort" , "Illegal entrant" , "One entering uninvited" .)

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

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