Crossword Genius

Second method to gain supremacy (4)

Ross

I believe the answer is:

sway

'supremacy' is the definition.
(thesaurus)

'second method' is the wordplay.
'second' becomes 's' (common abbreviation).
'method' becomes 'way' (I've seen this before**).
's'+'way'='SWAY'

'to gain' acts as a link.

(Other definitions for sway that I've seen before include "Move from side to side; influence" , "Pitch sideways" , "Move gently" , "Bend; influence" , "Oscillate" .)

I've seen this clue in The Telegraph.
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