Anything should if this should (5)
I believe the answer is:
ought
I believe this is a triple definition!
'anything' is the first definition.
(dialect term for 'anything')
'should' is the second definition.
(synonyms)
'if' acts as a link.
'this should' is the third definition.
(I've seen this in another clue)
(Other definitions for ought that I've seen before include "Have/has a duty (to do)" , "Tough (anag)" , "Strange thing" , "Should, had, better" , "It expresses duty or obligation" .)