Hackneyed ceremony after last part of Lent (5)
I believe the answer is:
trite
'hackneyed' is the definition.
(I know that hackneyed can be written as trite)
'ceremony after last part of lent' is the wordplay.
'ceremony' becomes 'rite' (rite is a kind of ceremony).
'after' means one lot of letters go next to another.
'last part of' indicates one should take the final letters.
The final letter of 'lent' is 't'.
'rite' after 't' is 'TRITE'.
(Other definitions for trite that I've seen before include "repeated too often" , "(Of an idea) lacking in originality" , "Overfamiliar through overuse" , "Dull, unoriginal" , "Stock" .)