Love a portion sliced by cook (9)
I believe the answer is:
adoration
'love' is the definition.
(I've seen this before)
'a portion sliced by cook' is the wordplay.
'portion' becomes 'ration' (ration is a kind of portion).
'sliced by' means one lot of letters goes inside another (inserted letters slice into the word).
'cook' becomes 'do' (I've seen this in other clues).
'a'+'ration'='aration'
'aration' enclosing 'do' is 'ADORATION'.
(Other definitions for adoration that I've seen before include "holding someone up a lot" , "Worship, veneration" , "Not a radio (anag.)" , "Feeling of profound love" , "enormous respect" .)