Absorb hot joke on the radio (6)
I believe the answer is:
ingest
'absorb' is the definition.
(I know that absorb can be written as ingest)
'hot joke on the radio' is the wordplay.
'hot' becomes 'in' (both can mean fashionable).
'joke' becomes 'jest' (synonyms).
'on the radio' indicates a 'sounds like' (homophone) clue.
'jest' sounds like 'gest'.
'in'+'gest'='INGEST'
(Other definitions for ingest that I've seen before include "Swallow, absorb" , "Take in with tinges" , "Absorb, assimilate" , "Gets in (anag.)" , "Absorb mentally" .)