Big spenders always include a tip (3)
I believe the answer is:
end
'a tip' is the definition.
(tip can mean the end of something)
'big spenders always include' is the wordplay.
'END' is hidden within the letters.
However, I am uncertain how this is indicated.
Can you help me to learn more?
(Other definitions for end that I've seen before include "target" , "Purpose of finish" , "Conclusion or goal" , "Cessation, conclusion" , "Butt" .)