Crossword Genius

Favouring just three selected letters (3)

Ross

I believe the answer is:

for

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'favouring' is the definition.
(to be 'for' something is to be in favour of it)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for for that I've seen before include "See 24" , "and 16 and 20: Notwithstanding" , "Pro" , "Approving" , "Favouring" .)

I've seen this clue in the Evening Standard.
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