Cuts, I see, in less pieces (6)

'cuts' is the definition.
(slice is a kind of cut)

'i see in less pieces' is the wordplay.
'see' becomes 'c' (the word for the letter, according to Chambers).
'in' means one lot of letters goes inside another.
'pieces' indicates anagramming the letters (the same pieces in a new order).
'i'+'c'='ic'
'less' is an anagram of 'sles'.
'ic' placed into 'sles' is 'SLICES'.