Loyal worker supporting Tory way (8)
I believe the answer is:
constant
'loyal' is the definition.
(thesaurus)
'worker supporting tory way' is the wordplay.
'worker' becomes 'ant' (worker is a type of ant).
'supporting' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'tory' becomes 'con' (abbreviation for Conservative).
'way' becomes 'st' (abbreviation for street).
'con'+'st'='const'
'ant' put after 'const' is 'CONSTANT'.
(Other definitions for constant that I've seen before include "staying the same" , "Perpetual" , "sustained" , "Faithful - unchanging" , "Persistent and unchanging" .)