Eavesdropped (9)
'eavesdropped' is the definition.
('listen in' can be a synonym of 'eavesdrop')
This is all the clue.
'eavesdropped' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for overheard that I've seen before include "Accidentally caught" , "Head rover (anag) - listened to secretly" , "Eavesdropped on (a conversation)" .)
'eavesdropped' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for listened that I've seen before include "Heard and heeded" , "Heard and paid heed" , "Having taken note" , "Paid attention to sound" , "Lent an ear" .)
(Other definitions for spied that I've seen before include "Seen" , "Watched secretly" , "Saw" , "Caught sight of" , "Spotted" .)