Close trick tip involving old penny (8)
I believe the answer is:
conclude
'close' is the definition.
(thesaurus)
'trick tip involving old penny' is the wordplay.
'trick' becomes 'con' (I've seen this before).
'tip' becomes 'clue' (I've seen this in other clues).
'involving' indicates putting letters inside.
'old penny' becomes 'd'.
'clue' enclosing 'd' is 'clude'.
'con'+'clude'='CONCLUDE'
(Other definitions for conclude that I've seen before include "Bring or come to an end (8)" , "reach verdict?" , "Terminate; deduce" , "Finish - deduce" , "Infer or bring to an end" .)