Doctor likes gripping cold cutting implement (6)
I believe the answer is:
sickle
'cutting implement' is the definition.
(sickle is a kind of cutting implement)
'doctor likes gripping cold' is the wordplay.
'doctor' indicates anagramming the letters.
'gripping' means one lot of letters goes inside another.
'cold' becomes 'c' (eg on taps).
'likes' anagrammed gives 'sikle'.
'sikle' going around 'c' is 'SICKLE'.
(Other definitions for sickle that I've seen before include "Reaping-hook" , "Reaping implement" , "Grass-cutting implement" , "Tool for cutting grass or crops" , "With a hammer, it forms a Communist symbol" .)