Gestured, selling a different key (9)
I believe the answer is:
signalled
'gestured' is the definition.
The definition and answer can be both to do with communicating as well as being past participle verbs.
Maybe there's a link between them I don't understand?
'selling a different key' is the wordplay.
'different' indicates anagramming the letters (letters placed in a different order).
'key' becomes 'd' (musical key).
'selling'+'a'='sellinga'
'sellinga' anagrammed gives 'signalle'.
'signalle'+'d'='SIGNALLED'
Can you help me to learn more?
(Other definitions for signalled that I've seen before include "Indicated" , "Shown" , "Gestured, signed" .)