The main point of registration (4)

I believe the answer is:

gist

'the main point' is the definition.
(the main point or meaning of something)

'of registration' is the wordplay.
'of' indicates a hidden word.
'GIST' can be found hidden inside 'registration'.

(Other definitions for gist that I've seen before include "Main point of the matter" , "Real point or substance" , "Main points" , "Drift" , "Core meaning" .)

I've seen this clue in The Irish Independent.

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