Intrusive binary responses one sent back (5)
I believe the answer is:
nosey
'intrusive' is the definition.
(I've seen this in another clue)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for nosey that I've seen before include "Offensively curious or inquisitive" , "Curious in nasal way" , "Impertinent" , "Showing too much interest in other people's affairs" , "Prying" .)