Perfunctory souvenir (5)
I believe the answer is:
token
This clue is a double definition.
'perfunctory' is the first definition.
(I've seen this in another clue)
'souvenir' is the second definition.
(I know that souvenir can be written as token)
(Other definitions for token that I've seen before include "Voucher (for, eg, books)" , "Counter" , "Keepsake or memorial as of friendship" , "empty gesture?" , "Done only as a symbolic gesture" .)