Put away in suitcase, a tuxedo (3)
I believe the answer is:
eat
'put away' is the definition.
(I've seen this before)
'in suitcase a tuxedo' is the wordplay.
'in' says the answer is hidden in the clue.
'EAT' can be found hidden inside 'suitcase a tuxedo'.
(Other definitions for eat that I've seen before include "Take food" , "get stuck in" , "tolerate in diet" , "Bit, chew and swallow" , "Corrode" .)