Sad Tory (4)

I believe the answer is:

blue

This clue is a double definition.

'sad' is the first definition.
(I know that sad can be written as blue)

'tory' is the second definition.
(blue can mean relating to the Conservative Party)

(Other definitions for blue that I've seen before include "Colour; squander" , "Conservative > depressed" , "Indecent" , "Spend all at once - colour" , "Dispirited in cerulean way" .)

I've seen this clue in The Independent.

Want a hint initially instead of a full solution? Install my app