Crossword Genius

One addict, I fancy, could show this (10)

Ross

I believe the answer is:

dedication

'show this' is the definition.
The definition suggests a singular noun which matches the answer.

'one addict i fancy' is the wordplay.
'fancy' indicates an anagram.
'one'+'addict'+'i'='oneaddicti'
'oneaddicti' is an anagram of 'DEDICATION'.

'could' is the link.

(Other definitions for dedication that I've seen before include "tribute" , "with which author often starts work" , "Commitment; inscription" , "Devotion (to a task)" .)

I've seen this clue in The Times.
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