See Director-General close to the gatehouse (5)
I believe the answer is:
lodge
'gatehouse' is the definition.
(I know that lodge is a type of gatehouse)
'see director-general close to the' is the wordplay.
'see' becomes 'lo' (archaic exclamation meaning 'look!').
'director general' becomes 'DG' (abbreviation in organisations eg the BBC).
'close to' says to take the final letters (the close/ending of).
The final letter of 'the' is 'e'.
'lo'+'dg'+'e'='LODGE'
(Other definitions for lodge that I've seen before include "Chalet" , "Get stuck" , "Cottage at the entrance to the grounds of a big house" , "Stick" , "See 9" .)