He’s going to love this magazine (5)
I believe the answer is:
hello
'magazine' is the definition.
(celebrity magazine)
'he's going to love' is the wordplay.
I cannot really see how this works, but
'love' could be 'o' (love means zero in tennis) and 'o' is present in the answer.
'going to' could be 'll' (as in he'll, we'll etc) and 'll' is found in the answer.
'he' is present in the answer.
No letters remain.
This explanation may well be incorrect...
'this' is the link.
Can you help me to learn more?
(Other definitions for hello that I've seen before include "Hi, howdy" , "Routine response to telephone call" , "Introductory greeting" , "Look at that" , "I say" .)