Building up NHS? Yes, it's struggling (9)

I believe the answer is:

synthesis

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'building' is the definition.
(thesaurus)

'up nhs? yes it's struggling' is the wordplay.
'up' indicates an anagram (letters get chucked up).
'struggling' becomes 's' (this could be a standard abbreviation I've not previously seen).
'nhs'+'yes'+'it'='nhsyesit'
'nhsyesit' with letters rearranged gives 'synthesi'.
'synthesi'+'s'='SYNTHESIS'

Can you help me to learn more?

(Other definitions for synthesis that I've seen before include "Process of bringing together to form a whole" , "Combination of components to form a whole" , "Result of combining" , "Combination of different elements into a whole" , "getting together tricky" .)

I've seen this clue in The Telegraph.

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