Welsh Rugby's show of indifference (5)
I believe the answer is:
shrug
'indifference' is the definition.
(I have seen 'Express indifference ' mean 'shrug' so perhaps 'indifference' could also mean 'shrug')
'welsh rugby's show' is the wordplay.
'show' says the answer is hidden in the clue.
'SHRUG' is hidden within 'welsh rugby'.
'of' acts as a link.
(Other definitions for shrug that I've seen before include "Raise one's shoulders" , "____ off, dismiss" , "indifferent response" , "Raise (shoulders) slightly" , "Express indifference" .)