Want to take part in “2” (4)
I believe the answer is:
need
This clue might be a double definition.
'want' is the first definition.
(I know that want can be written as need)
'take part in 2' is the second definition.
'need' can be an answer for 'take' (synonyms). I am not sure about the 'part in 2' bit.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for need that I've seen before include "Lack or require" , "Necessity" , "Shortage" , "Want - require(ment)" , "Necessitate" .)