Supposing Oscar to be languishing (7)
I believe the answer is:
opining
'supposing' is the definition.
The answer and definition can be both to do with communicating as well as being present participle verbs.
Maybe there's a link between them I don't understand?
'oscar to be languishing' is the wordplay.
'oscar' becomes 'O' (phonetic alphabet: alpha, bravo, charlie etc.).
'to be languishing' becomes 'pining' (I've seen this in another clue).
'o'+'pining'='OPINING'
Can you help me to learn more?
(Other definitions for opining that I've seen before include "Thinking" , "Expressing one's view" .)