Search for Indian on the radio? (4)
I believe the answer is:
seek
'search for' is the definition.
(thesaurus)
'indian on the radio?' is the wordplay.
'indian' becomes 'sikh' (I've seen this before).
'on the radio?' indicates a 'sounds like' (homophone) clue (I've seen 'on the radio' mean this).
'sikh' sounds like 'SEEK'.
(Other definitions for seek that I've seen before include "Ask for (permission)" , "Attempt to find; ask for" , "Attempt - search" , "Try to find" , "Try to locate or reach" .)