Sun perhaps in golden book (3)

I believe the answer is:

orb

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'sun' is the definition.
(I've seen this in another clue)

'in golden book' is the wordplay.
'in golden' becomes 'or' ('or' is the name for gold in heraldry. I am not sure about the 'in' bit.).
'book' becomes 'b' (abbreviation for book).
'or'+'b'='ORB'

'perhaps' is the link.

Can you help me to learn more?

(Other definitions for orb that I've seen before include "Ring" , "Sphere - eye" , "Spherical symbol of monarch's power" , "Sphere (found in regalia)" , "Poetically eye" .)

I've seen this clue in The Sun.

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