Demand that beginners make manifest (4,5)

I believe the answer is:

call forth

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'demand that beginners make manifest' is the definition.
'call forth' can be an answer for 'demand' (thesaurus). I'm unsure of the rest of the definition.

'demand that beginners make' is the wordplay.
'demand' becomes 'call for' (synonyms).
'that beginners make' becomes 'th' (I can't justify this - if you can you should believe this answer much more).
'callfor'+'th'='CALL FORTH'

Can you help me to learn more?

(Other definitions for call forth that I've seen before include "Evoke" , "Summon" .)

I've seen this clue in The Daily Express.

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