Heartless film character's time on popular island (3,3)
I believe the answer is:
tin man
'heartless film character's' is the definition.
(character in The Wizard of Oz)
'time on popular island' is the wordplay.
'time' becomes 't' (abbreviation).
'on' says to put letters next to each other.
'popular' becomes 'in' ('in' can mean trendy).
'island' becomes 'man' (the Isle of Man is an example).
't'+'in'+'man'='TIN MAN'
(Other definitions for tin man that I've seen before include "He seeks for a heart in Oz" , "6 [FRIEND OF DOROTHY]" , "one in 5d's company" .)