Happy to perform action that covers bulb? (9)

I believe the answer is:

delighted

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'happy to perform action that covers bulb?' is the definition.
'delighted' can be an answer for 'happy' (I've seen this in another clue). I'm unsure of the rest of the definition.

'action that covers bulb?' is the wordplay.
'action' becomes 'deed' (deed is a kind of action).
'that covers' indicates putting letters inside.
'bulb?' becomes 'light' (synonyms).
'deed' enclosing 'light' is 'DELIGHTED'.

Can you help me to learn more?

(Other definitions for delighted that I've seen before include "Over the moon" , "Joyful" , "Pleased as Punch" , "Greatly pleased" , "Overjoyed" .)

I've seen this clue in The Irish Times.

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