Old supporter of Sky TV kicking off eventually (2,4)
I believe the answer is:
at last
'eventually' is the definition.
(I've seen this before)
'old supporter of sky tv kicking off' is the wordplay.
'old supporter of sky' becomes 'Atlas' (in Greek myth Atlas held up the sky).
'kicking off' suggests taking the first letters (the letter which begins or kicks off the word).
The first letter of 'tv' is 't'.
'atlas'+'t'='AT LAST'
(Other definitions for at last that I've seen before include "Where cobbler located" , "'In the end (2,4)'" , "Finally, after much delay" , "In the end, after much delay" , "working as a cobbler?" .)