Go off entertaining book, and love The Iron Man? (5)
I believe the answer is:
robot
'the iron man?' is the definition.
(I've seen this in another clue)
'go off entertaining book and love' is the wordplay.
'go off' becomes 'rot' (as in food going off).
'entertaining' means one lot of letters goes inside another (inviting in, as for dinner).
'book' becomes 'b' (abbreviation for book).
'and' says to put letters next to each other.
'love' becomes 'o' (love means zero in tennis).
'b' after 'o' is 'ob'.
'rot' going around 'ob' is 'ROBOT'.
(Other definitions for robot that I've seen before include "Mechanism that can move like a human" , "Automaton or sci-fi creature" , "Man-made man - man-made machine" , "Unpaid worker" , "Programmable machine" .)