Think I would dine on eggs to start with (6)
I believe the answer is:
ideate
'think' is the definition.
(I know that think is a more specific form of ideate)
'i would dine on eggs to start with' is the wordplay.
'i would' becomes 'I'd'.
'dine on' becomes 'eat' (I've seen this in another clue).
'to start with' says to take the initial letters.
The first letter of 'eggs' is 'e'.
'id'+'eat'+'e'='IDEATE'
(Other definitions for ideate that I've seen before include "Form in the imagination" , "Form a picture of" , "Imagine (psychology), aid tee (anag.)" , "Fancy" .)