Also, he's not top of the range (5)
I believe the answer is:
andes
'the range' is the definition.
(South American mountain range)
'also he's not top' is the wordplay.
'also' becomes 'and' (both can mean in addition).
'not top' means to remove the first letter.
'hes' with its initial letter taken off is 'es'.
'and'+'es'='ANDES'
'of' acts as a link.
(Other definitions for andes that I've seen before include "Danes seen in mountains" , "Aconcagua the highest in this range" , "Mountain range in South America" , "Mountains of 6 dn" , "Mounts" .)