Crossword Genius

Link; take part in (4)

Ross

I believe the answer is:

join

This clue is a double definition.

'link' is the first definition.
(join is a kind of link)

'take part in' is the second definition.
(thesaurus)

(Other definitions for join that I've seen before include "Associate, combine" , "ally" , "make ends meet" , "Become a member" , "Link, connect" .)

I've seen this clue in The Times.
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