Let citizen fall to talk of other things (4,3,7)

'talk of other things' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'let citizen fall' is the wordplay.
I cannot quite see how this works, but
'citizen' could be 'subject' (I've seen this before) and 'subject' is located in the answer.
'fall' could be 'drop' (synonyms) and 'drop' is located in the answer.
The remaining letters 'the' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

'to' is the link.

Can you help me to learn more?