Conclude it's a tip (3)
I believe the answer is:
end
I believe this clue is a double definition.
'conclude' is the first definition.
(I've seen this before)
'a tip' is the second definition.
(thesaurus)
'it's' acts as a link.
(Other definitions for end that I've seen before include "Novel by Graham Greene" , "Conclude" , "Time to break-up (3,2,4) - See 12" , "American footballer" , "Aim; terminate" .)