Cooker at home once more (5)
I believe the answer is:
again
'once more' is the definition.
('again' can be a synonym of 'once more')
'cooker at home' is the wordplay.
'cooker' becomes 'aga' (I've seen this before).
'at home' becomes 'in' ('in' can be similar in meaning to 'at home').
'aga'+'in'='AGAIN'
(Other definitions for again that I've seen before include "10 10 [AGAIN" , "On the other hand" , "Next time" , "Repeatedly" , "second term" .)