Cause agitation in particular location, we hear (6)
I believe the answer is:
incite
'cause agitation' is the definition.
'incite' can be an answer for 'cause' (inciting is a kind of causing). I'm not certain of the 'agitation' bit.
'particular location we hear' is the wordplay.
'particular' becomes 'in' (I can't justify this - if you can you should give a lot more credence to this answer).
'location' becomes 'site' (site is a kind of location).
'we hear' indicates a 'sounds like' (homophone) clue.
'site' sounds like 'cite'.
'in'+'cite'='INCITE'
'in' is the link.
Can you help me to learn more?
(Other definitions for incite that I've seen before include "Egg on" , "Stir up (eg, violence)" , "Stir up, hatred say" , "Arouse to action" , "drive" .)