Nanny is glued in, sadly (7)

I believe the answer is:

indulge

I'm a little stuck... Click here to teach me more about this clue!

'nanny is' is the definition.
I can't tell whether this defines the answer.

'glued in sadly' is the wordplay.
'sadly' indicates anagramming the letters.
'glued'+'in'='gluedin'
'gluedin' anagrammed gives 'INDULGE'.

Can you help me to learn more?

(Other definitions for indulge that I've seen before include "pet" , "Gratify (an appetite)" , "Give free rein to" , "Pander to" , "Partake" .)

I've seen this clue in The Daily Express.

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