Poor Spoonerisms fail to display this (15)

I believe the answer is:

professionalism

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

'poor spoonerisms fail' is the wordplay.
'poor' is an anagram indicator.
'spoonerisms'+'fail'='spoonerismsfail'
'spoonerismsfail' is an anagram of 'PROFESSIONALISM'.

'to' acts as a link.

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(Other definitions for professionalism that I've seen before include "Skill not displayed by amateur" , "Competence of experts" , "Doctor needs to show this skill" .)

I've seen this clue in The Sunday Times.

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