Defensive position in favour of Tories’ leader (4)

I believe the answer is:

fort

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'defensive position' is the definition.
'fort' can be an answer for 'position' (I have seen 'Strategic position ' mean 'fort' so perhaps 'position' could also mean 'fort'). I am not certain of the 'defensive' bit.

'in favour of tories' leader' is the wordplay.
'in favour of' becomes 'for' (being for a particular cause).
'leader' indicates taking the first letters.
The first letter of 'tories' is 't'.
'for'+'t'='FORT'

Can you help me to learn more?

(Other definitions for fort that I've seen before include "Keep" , "& 22 US Army post" , "Military post in the old West" , "Citadel" , "Garrison" .)

I've seen this clue in The Times.

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