More heads of cabbage to remove (7)
I believe the answer is:
extract
'remove' is the definition.
(I know that extract is a more specific form of remove)
'more heads of cabbage to' is the wordplay.
'more' becomes 'extra' (I've seen this before).
'heads of' says to take the initial letters.
The first letters of 'cabbage to' is 'ct'.
'extra'+'ct'='EXTRACT'
(Other definitions for extract that I've seen before include "Passage selected from a larger work" , "(Piece) remove(d)" , "Passage taken from book etc" , "Short passage (of text)" , "Lift from book" .)