Programme that’s drivel, quietly being dropped (3)
I believe the answer is:
app
'programme' is the definition.
'drivel quietly being dropped' is the wordplay.
I cannot quite understand how this works, but
'quietly' could be 'pp' and 'pp' is found in the answer.
A single letter 'a' remains which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'that's' is the link.
(Other definitions for app that I've seen before include "Program for a smart phone, in short" , "Software item" , "Software for mobile devices, in short" , "Software program for a mobile device" , "bit of software" .)