Delighted in commotion regarding top dog (6)
I believe the answer is:
adored
'delighted in' is the definition.
(I've seen this in another clue)
'commotion regarding top dog' is the wordplay.
'commotion' becomes 'ado' (ado is a kind of commotion).
'regarding' becomes 're' ('re' means regarding or about).
'top' indicates taking the first letters (in a down clue, the first letter is top).
The initial letter of 'dog' is 'd'.
'ado'+'re'+'d'='ADORED'
(Other definitions for adored that I've seen before include "enjoyed very much" , "having lover" , "Worshipped and venerated" , "Idolised" , "hugely popular" .)