Returns to the bar casually yet eagerly! (7)

'eagerly' is the definition.
Both the answer and definition are adverbs.
Maybe there's a link between them I don't understand?

'returns to the bar casually' is the wordplay.
'returns' becomes 'idly' (I can't justify this - if you can you should give a lot more credence to this answer).
'to' says to put letters next to each other (I've seen this in other clues).
'casually' is an anagram indicator (a casual or disordered version of the letters).
'bar' with letters rearranged gives 'rab'.
'idly' put after 'rab' is 'RABIDLY'.

'yet' acts as a link.

Can you help me to learn more?