First movement outside of prisoner, leading to escape (7)
I believe the answer is:
prelude
'first movement' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'outside of prisoner leading to escape' is the wordplay.
'outside of' suggests removing the centre (only letters on the outside of the word).
'leading to' is a charade indicator (letters next to each other) (some letters go before or lead others).
'escape' becomes 'elude' (eluding is a kind of escaping).
'prisoner' with its middle taken out is 'pr'.
'pr'+'elude'='PRELUDE'
Can you help me to learn more?
(Other definitions for prelude that I've seen before include "Introductory piece of music" , "Introductory musical piece" , "Opening piece" , "Overture" , "Introductory passage" .)