Crossword Genius

In support of backing the ruling head (3)

Ross

I believe the answer is:

for

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This could be a double definition.

'in support of' is the first definition.
(as in being for a particular cause)

'backing the ruling head' is the second definition.
'for' can be an answer for 'backing' (I've seen this in another clue). I am not sure about the 'the ruling head' bit.

Can you help me to learn more?

(Other definitions for for that I've seen before include "On behalf of" , "Favouring" , "In support of" , "On the side of" , "See 24" .)

I've seen this clue in the Evening Standard.
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