Popular present, for example, that's heavy! (7)
I believe the answer is:
intense
'heavy' is the definition.
(similar in meaning)
'popular present for example' is the wordplay.
'popular' becomes 'in' ('in' can mean trendy).
'present for example' becomes 'tense' (present is a kind of tense).
'in'+'tense'='INTENSE'
'that's' is the link.
(Other definitions for intense that I've seen before include "In an extreme degree" , "Extremely forceful" , "'Ardent, forceful (7)'" , "Feeling deeply" , "Very concentrated or passionate" .)