Monster one may read about in Mother Goose (4)
I believe the answer is:
ogre
'monster' is the definition.
(fairy tale monster)
'about in mother goose' is the wordplay.
'about' is a reversal indicator.
'in' indicates a hidden word.
'ergo' is hidden within 'mother goose'.
'ergo' in reverse letter order is 'OGRE'.
'one may read' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for ogre that I've seen before include "Jack's giant perhaps" , "Has a monstrous role" , "The giant is some goer" , "ugly one" , "Ugly giant" .)