Mr T going missing - tightwad! (5)
I believe the answer is:
miser
'tightwad' is the definition.
(synonyms)
'mr t going missing' is the wordplay.
'mr' becomes 'mister' (Mr is short for Mister).
'going missing' suggests deleting specific letters.
'mister' with 't' taken out is 'MISER'.
(Other definitions for miser that I've seen before include "One of the people who spend least" , "Mean person" , "man, that's close" , "One giving little" , "Stingy type" .)