Improvised on the radio in break (4)
I believe the answer is:
rift
'break' is the definition.
(rift can mean a break or opening)
'improvised on the radio' is the wordplay.
I cannot quite understand how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
The remaining letters 'rif' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'in' is the link.
Can you help me to learn more?
(Other definitions for rift that I've seen before include "Serious falling out" , "Breach, rupture" , "Schism (in the lute?)" , "Breach; crack" , "Lack of harmony" .)