Thomas was this time put in taxi after party (7)
I believe the answer is:
doubter
'thomas was' is the definition.
(I've seen this before)
'time put in taxi after party' is the wordplay.
'time' becomes 't' (abbreviation).
'put in' is an insertion indicator.
'taxi' becomes 'uber'.
'after' says to put letters next to each other.
'party' becomes 'do' (do can informally mean a party).
't' placed within 'uber' is 'ubter'.
'ubter' put after 'do' is 'DOUBTER'.
'this' is the link.
(Other definitions for doubter that I've seen before include "One who is not sure" , "E.g. St Thomas" , "one such as Thomas" .)