___ Thai (3)
'thai' is the definition.
(synonyms)
This is all the clue.
(Other definitions for siamese that I've seen before include "like a cat" , "Pugnacious aquarium species -- shagginess, if I'm thief (anag)" , "cats?" , "Twin" , "type of cat" .)
(Other definitions for pad that I've seen before include "Absorbent material" , "Sole" , "writer's block" , "Helicopter landing area" , "Sports guard; home (colloq.)" .)