Like a lavish meal, but with no starter to relish (3,2)
I believe the answer is:
lap up
'relish' is the definition.
(I've seen this before)
'like a lavish meal but with no starter' is the wordplay.
'like a lavish meal' becomes 'slapup' (a slap-up meal is an excellent meal).
'but with no starter' means to remove the first letter.
'slapup' with its initial letter removed is 'LAP UP'.
'to' acts as a link.
(Other definitions for lap up that I've seen before include "Scoop" , "Delight" , "Drink (water) like a dog" , "of future monarch?" , "Eagerly enjoy" .)