Section of head exposed at the front with large surgical tool (7)
I believe the answer is:
scalpel
'surgical tool' is the definition.
(I've seen this before)
'section of head exposed at the front with large' is the wordplay.
'section of head' becomes 'scalp' (I am not sure about this - if you are sure you should believe this answer much more).
'at the front' says to take the initial letters.
'with' is a charade indicator (letters next to each other).
'large' becomes 'L' (eg in clothes sizes).
The initial letter of 'exposed' is 'e'.
'scalp'+'e'+'l'='SCALPEL'
Can you help me to learn more?
(Other definitions for scalpel that I've seen before include "Surgical tool" , "Sharp cutting tool" , "Surgical implement" , "Surgical instrument" , "Small surgical knife" .)